You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: My name is Charles Miller.

ASSISTANT: Please hold on for a while.

USER: Ok.

ASSISTANT: Sorry Miller, I did not find any reservation on your name in our data base.

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

ASSISTANT: Welcome, have a nice day.