You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, kindly share your name.

USER: Ok, my name is Donna Thompson.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

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

ASSISTANT: Thanks for reaching us.