public void ArrivalDate()
        {
            bool   done  = false;
            string input = "";

            while (!done)
            {
                Console.WriteLine("What is the arrival date? (YYYY-MM-DD)");
                input = Console.ReadLine();
                Console.WriteLine();
                done = helper.DateIsValid(input);
            }

            reservationRequest.FromDate = Convert.ToDateTime(input);
        }