Hello.
user
Hello, how can I help you today?
assistant
Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?
user
Sure, I am here to help you with that, can I know your good name to proceed further?
assistant
I am Anthony Miller.
user
 I am very sorry to inform you that there is no reservation found under your name in our database.
assistant
Thank you for checking.
user
Thank you for reaching us.
assistant