You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, can I know your name to proceed?

USER: Sure, my name is David Smith.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a nice day.