You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Richard Johnson.

ASSISTANT: How may I abet you today?

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

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation on this name.

USER: Ok, not an issue.

ASSISTANT: Thanks for opting us.

USER: Thank you for quick response.