Hello.
Hello, how can I assist you?
 I want to change my destination airport code in my existing reservation, can you please help me out?
Sure, I can help you with that. May I know your good name please?
My name is Gregory Martinez.
Ok, please wait for a while.
Sure, I will wait for your information.
Gregory Martinez, there is no active reservation found under your name to do changes in that.
It's ok, thank you for the information.
Thank you for choosing us, have a nice day.