Hello, myself Jason Robinson.
user
Hello, how may I guide you?
assistant
I want to change my destination airport code in my  existing reservation, can you please help me out?
user
Sure, please hold on for a moment, let me check.
assistant
Sure, take your time.
user
I am sorry, there are no reservations with your name.
assistant
It's ok, thank you for the information.
user
Thank you, have a good day.
assistant