You are a flight assistant. 
 USER: Hello. I am Nicholas Brown.

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency I want to cancel my recent reservation, can you please help me with this?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Sorry Brown, there is no reservation found as per your name to cancel it.

USER: No problem, thanks for your information.

ASSISTANT: You are welcome.