You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Margaret Robinson. I would like to change my reservation, could you help me out?

ASSISTANT: Sure, I will help you.

USER: Ok.

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

USER: That's ok.

ASSISTANT: Thank you for opting us.

USER: Thank you for your help.