You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: May, I know your good name?

USER: Sure, my name is James Clark.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, we found no reservation on your given name.

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

ASSISTANT: Thank you for reaching us.