You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change my destination airport code in my existing reservation, can you please help me out?

ASSISTANT: May I know your name please?

USER: Sure, my name is Benjamin Green.

ASSISTANT: Please wait a while.

USER: Ok, take your time.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for opting us.