You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: Paul Williams is my name.

ASSISTANT: How may I serve you?

USER: My friends Death valley adventure has been cancelled, so I need to cancel my reservation. Can you please cancel my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We found a reservation on your name. Shall I proceed with cancelling?

USER: Yes, you can.

ASSISTANT: Your reservation has been cancelled.

USER: Thanks for cancelling my ticket.

ASSISTANT: Thank you for choosing us.