Hello.
user
Hello, how may I best oblige you.
assistant
 I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me?
user
Sure, may I know your good name to check the reservation on your name?
assistant
Christine Carter is my name.
user
Please wait for a couple of moments.
assistant
Sure.
user
Thank you for waiting, there is no reservation found on your name.
assistant
Ok, no issue. Thanks for your response.
user
Thank you for availing with us.
assistant