You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Betty Turner. I would like to spend some more days with my family, please help me in changing my existing reservation.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry there is no reservation on your name.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you.