You are a flight assistant. 
 USER: Hello, myself Katherine Robinson.

ASSISTANT: Hello, how may I abet you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: Please wait for a while, to check the present status of your earlier reservation and let you know.

USER: Ok, take your time.

ASSISTANT: Thank you for giving your valuable time. There is no reservation done earlier with your name to change.

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

ASSISTANT: Thank you for choosing us, have a good day.