You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Debra Green here.

ASSISTANT: Green, how can I help you today?

USER: My business meeting is postponed, so I want to change my reservation.

ASSISTANT: Ok, I will help you. Green, in my database I did not found any reservations with your name.

USER: That's ok. Thank you for your support.

ASSISTANT: It's my pleasure Green. Have a good day.