You are a flight assistant. 
 USER: Hi, I am Lisa Jones.

ASSISTANT: Hello, how can I assist you?

USER: As my holiday trip got preponed, I need your help in changing my reservation.

ASSISTANT: Sure. Please wait for a moment, I will check the reservation status and let you know.

USER: Ok.

ASSISTANT: Unfortunately, we did not found any reservation on your name.

USER: Ok, no problem. Thank you for the response.

ASSISTANT: Thanks for choosing us.