How do i obtain the value of an item in a conditional statement?

How do I obtain the value of a dictionary item in a conditional statement for instance

names = {"one":"john", "two":"justin"}
prompt = input("enter option: ")
if prompt == names["one"]:
    print("hey, I am here")

What will you suggest I go about it with a solution similar to line 3 so that I if the user inputs a key for instance "one" it prints "john"