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: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Sure, my name is Catherine Wilson.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, There was no reservation found on your name to change it.

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

ASSISTANT: Thank you for choosing us.