Hello.
Hello. How may I serve you now?
 I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.
Ok, I will help you in changing the reservation. May I know your good name?
Sure, my name is Timothy Walker.
Please, wait a minute.
Sure.
Thanks for your time, there is no reservation found on your name.
No problem, thanks for your support.
Thank you for opting us.