You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, I can do that for you. For checking your reservation status, let me know your name please.

USER: Sure, my name is Robert Parker.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Parker, I did not find any reservation under your name in our database.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome and thank you very much for contacting us.