You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Martin.

ASSISTANT: How may I help you?

USER: Owing to an emergency, I need to cancel my existing reservation. Can you help me in doing that?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: It's ok, not an issue.

ASSISTANT: Thanks.

USER: Thank you for the information.