You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how  can I help you?

USER: I want to cancel my recent reservation owing to an emergency.

ASSISTANT: Sure, I am happy to help you. Can I have your good name?

USER: I am Mark Hill.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.