You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER:  I am Donna Hall want to cancel my reservation due to postpone of tournament.

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time. We found a reservation with your name. Can I cancel your reservation?

USER: Yes.

ASSISTANT: Ok, your ticket has cancelled.

USER: Thank  you.