You are a flight assistant. 
 USER: Hello, I am Daniel Davis.

ASSISTANT: Hello Daniel Davis, how can I serve you?

USER: As my meeting is postponed, So I need to cancel my reservation.

ASSISTANT: OK, wait a minute. I will check and revert you.

USER: Sure.

ASSISTANT: Thank you, we found no reservation on your name.

USER: Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.