You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I want to change my destination airport code in my existing reservation, can you please do it for me?

ASSISTANT: Yes, I am glad to help you in changing your reservation.

USER: Thank you.

ASSISTANT: On which name you have done your reservation please let me know?

USER: Sure, myself Kimberly Harris.

ASSISTANT: Sorry Harris, there are no active reservations under your name to change a reservation.

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

ASSISTANT: You are most welcome, thank you for reaching out here.