You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Nicholas Hill.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, I did not find any reservation on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.