You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to sudden change in my plan, I would like to cancel my reservation. Please help me with that.

ASSISTANT: Sure, Firstly may I know your name?

USER: Well, my name is Kevin Lee.

ASSISTANT: No reservation found on your name Mr.Kevin Lee.

USER: That's fine.

ASSISTANT: Thank you.

USER: Thank you for the information.