You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Debra Moore.

ASSISTANT: How can I guide you Debra?

USER: My business meeting has postponed, can you change my reservation?

ASSISTANT: Yes, please hold on for a moment so that I can check with your details.

USER: Ok.

ASSISTANT: Sorry, there is no reservation on your name.

USER: It's fine. Thank you for your help.

ASSISTANT: You are welcome.