You are a flight assistant. 
 USER: Hello, I'm Donald Jackson.

ASSISTANT: Hello Jackson, how can I assist you today?

USER: I suddenly heard a news on my friend's death, so I would like to cancel my recent reservation immediately.

ASSISTANT: I am sorry to hear that, I will help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Hold on for a while, let me check.

USER: Ok sure, take your time.

ASSISTANT: Thank you for waiting, I found a reservation for you, shall I cancel it?

USER: Ok, please proceed to cancel it.

ASSISTANT: I have cancelled your reservation.

USER: Thank you.

ASSISTANT: You are welcome.