Hello.
user
Hello, how may I help you?
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 Karen Adams.
user
 I am very sorry to inform you that there is no reservation found under your name in our database.
assistant
No problem, thank you for checking.
user
Thank you for reaching us.
assistant