You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to some problems my trip was cancelled so can you please cancel my flight ticket?

ASSISTANT: May I know your name please?

USER: Thank you for your response, my name is Thomas Harris.

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

USER: That's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.