You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like spend some more time with my family, could to change my previous reservation on my name?

ASSISTANT: Sure, I'm happy to help you. Before that, as it is mandatory to know your name before changing the reservation. Could I know your name please?

USER: Please, check my previous reservation on Anthony Davis name.

ASSISTANT: Ok, hold on for a moment. Let me check. Sorry Davis, there are no flights reserved under your name.

USER: That's ok, I guess my brother already changed my reservation.

ASSISTANT: May be, thank you for choosing our services.

USER: Thank you for helping me.

ASSISTANT: Have a great day.