You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can aid you at present?

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

ASSISTANT: Sure, I am here to help you with cancellation.

USER: Thank you.

ASSISTANT: Can I have your good name please?

USER: Donna Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found on your name to cancel it.

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

ASSISTANT: Thank you for approaching us.