You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Carol Young here. I would like to spend some more days with my family, so please help me in changing my existing reservation.

ASSISTANT: Sure, please wait a moment I will check your reservation details and proceed further.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you for reaching us, have a nice day.