Hello.
user
Hello, how may I support you?
assistant
 I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.
user
Sure, may I know your good name?
assistant
Sure, my name is Melissa Green.
user
Please wait for a minute, I will revert to you with current position.
assistant
Sure.
user
There is no reservation found with your name.
assistant
No problem, thanks for your service.
user
Thank you for availing us.
assistant