You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to postpone my reservation. Can you amend my reservation?

ASSISTANT: May I know your name?

USER: I am Kevin Carter.

ASSISTANT: Sure, I will help you. Please wait for a moment.

USER: Take your time.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: No issues. Thank you for checking.

ASSISTANT: You are welcome, have a nice day.