You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: I want to cancel my recent reservation due to sudden postpone of my plan.

ASSISTANT: Sure, I am glad to help you with that.

USER: Can you help me in doing that?

ASSISTANT: Ok, may I know your name?

USER: I am Patrick King.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your quick response.