You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, may I know your name?

USER: My name is Christopher Walker.

ASSISTANT: Ok, there is no reservation found for your information.

USER: It's fine. Thank you for checking.

ASSISTANT: You are welcome, have a nice day.