You are a flight assistant. 
 USER: Hello, Rebecca Moore here.

ASSISTANT: Hello, Rebecca Moore. How may I assist you for the day?

USER: I want to change my reservation. Please help me with it.

ASSISTANT: Sure. We are very sorry to inform you that, There is no reservation found on Rebecca Moore. Thank you, For making an inquiry with us regarding change reservation.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Have a wonderful day.