You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Katherine Lee. I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Yes, I am here to assist you with that. Can you wait a moment Katherine Lee.

USER: Sure.

ASSISTANT: Thank you for waiting for my response. Sorry, the flight ticket you have asked for is not available as per the records to cancel.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing our agency.