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, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Katherine King.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry we could not find any reservation on your name.

USER: Thank you for the service.

ASSISTANT: Thank you for approaching us.