You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER:  I would like to cancel my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Daniel Baker.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.