how to if else on controller for search function?

So i have a controller with a basic search function and i want to know when a user click the search button if there is data exist i want it to return the same page with error message, but if data not exist i want return another page. how can i do that? my code as below:

controller:

public function search(Request $request, $companyID, $entityType)
        {
                $data = [];
                $intentTypes = DiraQuestion::select('intent')->where('company_id', $companyID)->groupBy('intent')->get();

                foreach ($intentTypes as $intent) 
                {
                        $data[$intent->intent] = $intent->intent;
                }

                $q = $request->q;
            $user = DiraQuestion::select('eVal')->where('company_id', $companyID)->where('eType', $entityType)->where('eVal','LIKE','%'.$q.'%')->groupBy('eVal')->get();

            return view('AltHr.Chatbot.addType', compact('data','entityType','companyID'))->withDetails($user)->withQuery($q);
        }

my current view page which shows if exist and if not exist shows form:

@if(isset($details))
<div class="container-fluid container-fixed-lg">
        <div class="row">
                <div class="col-md-12">
                        <div class="panel panel-default">
                                <!-- <div class="panel-heading">
                                        <div class="panel-title"><b></b></div>
                                        <div class="clearfix"></div>
                                </div> -->
                                <div class="panel-body">
                                        <div class="form-group edit-response-container">
                                                <div class="col-md-12">
                                                        @foreach($details as $user)
                                                <p><span style="color:red;"></span> is already included!</p>
                                            @endforeach
                                        </div>

                                                @if($details->isEmpty())
                                                <form action="" method="post">
                                                        
                                                        <!-- @if(empty($data))
                                                        <p>No predefined intents.</p>
                                                        @else -->
                                                        <div class="col-md-12">
                                                                <div class="form-group form-group-default required">
                                                                        <label>New Type</label>
                                                                        <input type="text" class="form-control" name="entityValue" placeholder="" value="" required readonly/>
                                                                </div>
                                                        </div>
                                                        <!-- <div class="col-md-12">
                                                                <div class="form-group form-group-default required">
                                                                        <label>New Question</label>
                                                                        <input type="text" class="form-control" name="question" placeholder="Enter Sample Question" required>
                                                                </div>
                                                        </div>
                                                        <div class="col-md-12">
                                                                <div class="form-group form-group-default required">
                                                                        <label>Intent</label>
                                                                        <select class="full-width" name="intent" data-init-plugin="select2" required>
                                                                                <option selected disabled></option>
                                                                @foreach($data as $datas)
                                                                <option value=""></option>
                                                                @endforeach
                                                                        </select>
                                                                </div>
                                                        </div> -->
                                                        <div class="col-md-12">
                                                                <div class="new-field">
                                                                        <div class="form-group-attached">
                                                                                <div class="form-group form-group-default required">
                                                                                        <label>Synonyms:</label>
                                                                                        <input type="text" class="form-control" name="syn" placeholder="Enter Synonyms" />
                                                                                </div>
                                                                        </div>
                                                                </div>
                                                                <p><i>*Enter All Synonyms Separating With ','</i></p>
                                                        </div>


                                                        <div class="col-md-12">
                                                                <br>
                                                                <!-- <button type="button" class="btn alt-btn-green alt-btn btn-xs add-new">Add Synonym</button> -->
                                                                <button type="submit" class="btn alt-btn-green alt-btn btn-xs">Save</button>

                                                                <a href="" class="btn alt-btn-green alt-btn btn-xs">test</a>

                                                        </div>
                                                        @endif
                                                </form>
                                                @endif
                                        </div>
                                </div>
                        </div>
                </div>
        </div>
</div>
@endif

as you can see currently if data exist, it shows error message on the same page, but if no data it shows a form on the same page itself.. i want it to route to another page when there is no data found.