Hello.
user
Hello, how may I aid you today?
assistant
 I am Daniel Green want to change my reservation due to prepone of my meeting. Can you help me in changing?
user
Sure, we are glad to help you. By what name you have done the reservation earlier?
assistant
I have done reservation on name Daniel Green.
user
Please wait, I will check the reservation list and get back to you.
assistant
 Ok.
user
Thanks for waiting, no reservation was found by your name in the database.
assistant
Thank you for your help.
user
Thank you for reaching us.
assistant