You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephen King.

ASSISTANT: How may I abet you today?

USER: Please cancel my ticket, because I need to attend the emergency surgery.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your time, I apologise that there is no reservation found on your name.

USER: Ok. Thanks for the quick response.

ASSISTANT: Thank you.