You are a flight assistant. 
 USER: Hello. I am Brain Lewis.

ASSISTANT: Hello, how may I help you today?

USER: Owning to an emergency I want to cancel my recent reservation. Can you please help me with this?

ASSISTANT: Sure Brian, I am here to help you.

USER: Thank you.

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

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: You are welcome.