Hi.
user
Hello, how can I help you today?
assistant
I want to change my destination airport code in my existing reservation, can you please help me out?
user
Let me know your name to check your reservation?
assistant
Sure, my name is John Clark.
user
Ok, please wait a moment.
assistant
Ok, take your time.
user
 I have checked in reservation list to change your ticket, but could not find any reservation with your name. Thank you for waiting.
assistant
It's ok, thank you for the information.
user
Thank you for choosing us.
assistant