You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Gregory Hill.

ASSISTANT: I am sorry no reservation found on your name.

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

ASSISTANT: Thank you for choosing us.