Hello.
user
Hello, how may I serve you today?
assistant
 I got an appointment to meet obligates of United states but suddenly they went to another location on the same dates, can you please help me in flight ticket modification process?
user
Sure, I am here to help you.
assistant
Thanks for considering my request.
user
May I know your good name to proceed further?
assistant
Sure, my name is Gary Mitchell.
user
There is no reservation found on your name in our database.
assistant
Ok, thanks for your information.
user
Thank you.
assistant