You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My friend birthday party place has been changed to Detroit. Can you please change my existing reservation?

ASSISTANT: May I know your name please?

USER: Sure, I am Deborah Wilson.

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

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for opting us.