Hi.
Hello, how can I provide assistance to you?
I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.
Ok, may I know your name?
Sure, Sandra Campbell is my name.
 Please wait for a while, I will check the reservation status and get back to you.
Sure.
Sorry, there is no reservation found on your name.
Ok, not at all a problem. Thanks for the information.
Thank you for availing us.