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