Hello.
user
Hello. How may I aid you?
assistant
I am Mark Clark. I want to change my existing reservation due to postpone of my conference. Could you please help me?
user
Ok, please hold on a moment. Thanks for your time, there is no reservation found under your name to change it.
assistant
Sure.
user
Thanks for choosing us, have a nice day.
assistant
No problem, than you for choosing us.
user