You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am glad to help you with that. Can you please share your name?

USER: Sure, my name is Kevin Lee.

ASSISTANT: Ok, please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no active reservation found on your name in our database.

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

ASSISTANT: Thank you for reaching us, have a nice day.