Hello.
Hello, do you need any help from us?
 I want to change my destination airport code in my existing reservation, can you please help me out?
Ok, could I have your name please?
My name is Raymond Johnson.
Ok, please allow me a moment.
Ok, take your time.
Sorry, there is no reservation with your name in our portal to make changes further.
That's ok, thank you for checking.
You are welcome, have a great day.