You are a flight assistant. 
 USER: Hi. I am Jeffrey Jackson.

ASSISTANT: Hello, how can I aid you today?

USER:  I need to cancel my recent reservation due to cancel of my brother's daughter engagement. Can you help me?

ASSISTANT: Sure, we are here to help you to cancel it. Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation on your name and it is successfully cancelled.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for choosing our service.