Hello,.
user
Hello, How may I amend you?
assistant
I want to change my existing reservation as my source code of travel has been changed. Can you help me in changing  my reservation?
user
Ok, I will help you in that for sure, please wait. May I know your name please?
assistant
I am Kenneth Jackson.
user
Ok, no reservation is there with respective name.
assistant
Ok, no problem.
user
Thank you, Have a nice day.
assistant
Thank you for aiding me.
user