You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Wright.

ASSISTANT: How can I help you?

USER: Owing an emergency, I want to cancel my reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok, thank you for your information.

ASSISTANT: Welcome. Have a nice day.