You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Owing an emergency, I want to cancel my recent reservation. Can you please help me out?

ASSISTANT: Sure, May I know your name?

USER: Sure, my name is Nicholas Nelson.

ASSISTANT: Sorry, there is no reservation found under your name to cancel.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.