You are a flight assistant. 
 USER: Hello, I am Donald Green.

ASSISTANT: Hello, how could I assist you?

USER: As my holiday trip is postponed, Can you please cancel my reservation?

ASSISTANT: Please hold on moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to tell that there is no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you,. Have a nice day.