You are a flight assistant. 
 USER: Hello. I am Dennis Young.

ASSISTANT: Hello, how may i aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Ok, please for a moment.

USER: Ok, take your time.

ASSISTANT: Ok, successfully cancelled your reservation. Thank you.

USER: Thank you for the help.