You are a flight assistant. 
 USER: Hello,. I am Katherine Collins.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to cancel.

USER: That's fine, thanks for your service.

ASSISTANT: Thanks for availing us.