Hello.
user
Hello.
assistant
I am Mark Hall.
user
How may I guide you?
assistant
I would like to change my reservation as I  am moving to business trip, can you please help me out?
user
Sure, may I know your name for checking purpose?
assistant
I already mentioned above.
user
There is no reservation obtained in our data base to modify the ticket.
assistant
Ok no problem, thank you for your services.
user
Thank you for approaching us, have a nice day.
assistant