You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My friend's had cancelled the trip, So I need to cancel my recent reservation. Please help me that.

ASSISTANT: Ok, to cancel reservation may I know your name?

USER: Ok, my name is Katherine Lee.

ASSISTANT: Lee, no reservations with your name.

USER: It's ok, thank you for your information.

ASSISTANT: You are welcome. Have a nice day.