You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

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

ASSISTANT: Sure, l will help you.

USER: Thanks.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Stephen Allen.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name to change.

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

ASSISTANT: Thank you for approaching us.