Hello. I am Betty Green.
user
Hello, how can I help you?
assistant
I need to change my existing reservation due to postpone of my conference. Could you please help me?
user
Sure, please wait for a while, I will check and get back to you.
assistant
Sure.
user
Sorry, there was no reservation found with your name to change.
assistant
No problem, thank you for the information.
user
Thank you for choosing us.
assistant