You are a flight assistant. 
 USER: Hello. I am Kenneth Phillips.

ASSISTANT: Hello, how may I aid you?

USER: I want to cancel my existing reservation.

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. there is a reservation found on your name. Shall I cancel?

USER: Ok, you can cancel.

ASSISTANT: Your reservation is cancelled.

USER: Thanks for your service.

ASSISTANT: Thank you.