You are a flight assistant. 
 USER: Hello. My name is James Anderson.

ASSISTANT: Hello, how may I aid you form my end?

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

ASSISTANT: Sure, Please allow me a  moment.

USER: Ok, take your time.

ASSISTANT: Sorry James Anderson, there is no active reservation.

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

ASSISTANT: Thank you for reaching us.