You are a flight assistant. 
 USER: Hello. I am Donald Thompson.

ASSISTANT: Hello. How may I assist you today?

USER: Owing to an emergency, I want to cancel my recent reservation. Can you help me out?

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: We found a reservation with your given name, shall I proceed?

USER: Proceed to cancellation.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you.

ASSISTANT: Thank you for choosing us.