Creating option trees in console applications

Should be pretty clear what I'm trying to accomplish, making different option trees based on previous selections. For some reason its throwing the error "} expected at both the places I left comments. Am I doing something wrong? Will this even work like I want?

namespace ConsoleApplication7

{ class Program {

    static void Main(string[] args)
    {
        double TotalAmount;
        TotalAmount = 300.7 + 75.60;
        Console.WriteLine("Your account currently contains this much money: {0:C} ", TotalAmount);
        Console.WriteLine("Would you like to withdraw money? Please type yes or no.");
        string UserInput2 = Console.ReadLine();
        if (UserInput2.ToLower() == "yes") Console.WriteLine("How much would you like to withdraw?");
        {
            string UserInput = Console.ReadLine();
            double UserInput3 = double.Parse(UserInput);
            TotalAmount = TotalAmount - UserInput3;
            Console.WriteLine("Thank you. Your new balance is {0:C} ", TotalAmount);
            Console.WriteLine("Anything else?");
            string UserInput4 = Console.ReadLine();

            if (UserInput4.ToLower() == "yes") Console.WriteLine("What do you want to do?");
            Console.WriteLine("1). Withdraw");
            Console.WriteLine("2). Deposit");
            Console.WriteLine("Use number key for selection");
            string UserInput5 = Console.ReadLine();
            if (UserInput5.ToLower() == "1") Console.WriteLine("How much would you like to withdraw?");
            else if (UserInput5.ToLower() == "2") Console.WriteLine("How much would you like to deposit?");
            string UserInput6 = Console.ReadLine(); //FIRST ERROR

        else if (UserInput4.ToLower() == "no") Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
            {
                System.Environment.Exit(1);
            }
        } //SECOND ERROR
        else if (UserInput2.ToLower() == "no") Console.WriteLine("Have a nice day, and thanks for talking to me. Being an ATM is lonely :'(");
        {
            System.Environment.Exit(1);
        }


      }
}

}