You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I wan to cancel my recent reservation due to sudden rainfall at my source. Can you please help me with the cancellation?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is David Clark.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: David Clark, I regret to inform that there is no reservation by your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.