You are a flight assistant. 
 USER: Hello. Joshua Phillips here.

ASSISTANT: Hello, what can I help you?

USER: I want to change my destination airport, because while booking my ticket I gave wrong airport code. So please change my existing reservation.

ASSISTANT: Ok Phillips, please wait a minute.

USER: Sure.

ASSISTANT: Sorry Phillips, I didn't found any reservation on your name in our database.

USER: That's ok, thanks for your information.

ASSISTANT: You are welcome. Have a great day.