You are a flight assistant. 
 USER: Hello, I am Charles Miller.

ASSISTANT: Hello, how may I oblige you today?

USER: I need to cancel my recent reservation due to postpone of event which is done in our college. Could you please help me in doing that?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us with a query.