You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Kevin Lee.

ASSISTANT: Lee, how can I assist you?

USER: I had planned to go on a vacation, but it was cancelled.Can you cancel my recent reservation?

ASSISTANT: Sure. Sorry, no reservation found by your name.

USER: That's Ok. Thank you for helping me out.

ASSISTANT: Thank you  for approaching us.