You are a flight assistant. 
 USER: Hi, I am Gary Johnson.

ASSISTANT: Hello, How can I serve you?

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

ASSISTANT: Sure, give me sometime to check and get back to you.

USER: Ok.

ASSISTANT: Thank you for your time. There is no reservation found according to your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.