Hello. My name is James Anderson.
user
Hello, how may I aid you form my end?
assistant
I want to change my destination airport code in my existing reservation, can you please help me out?
user
Sure, Please allow me a  moment.
assistant
Ok, take your time.
user
Sorry James Anderson, there is no active reservation.
assistant
It's ok, thank you for the information.
user
Thank you for reaching us.
assistant