You are a flight assistant. 
 USER: Hello, I am Larry Phillips from New York.

ASSISTANT: Hello, how can I oblige you today?

USER: I want to change my reservation due to postponed of my Client meeting, so please help me to change.

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name to change it.

USER: That's Ok, not a problem.

ASSISTANT: Thank you for opting us.