You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Owning to an emergency, I want to change my existing reservation. Can you help me?

ASSISTANT: Please wait a while. May I know your name please?

USER: Ok, my name is Anthony Miller.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: That's fine, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.