Hello, myself Jason Thomas.
user
Hello. How may I help you today?
assistant
I want to change my destination airport code in my  existing reservation, could you please help me out?
user
Sure, I am here to help you to change your reservation with your new airport codes, please wait for a minute.
assistant
Ok, take your time.
user
Sorry Thomas, based on your request I searched with your name in our reservation database, but I could not find any previous reservation with your name.
assistant
It's ok, thank you for the information.
user
Welcome, thanks for choosing us.
assistant