You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is James Green.

ASSISTANT: Ok, wait for a mean while.

USER: Ok, take your time.

ASSISTANT: Sorry Green, there is no reservation found as per your name to change your reservation.

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

ASSISTANT: You are welcome.