 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
Let me know your name to check your reservation?
assistant
I am Dorothy Hall.
user
 I am sorry to say you that there is no reservation found under your name in our database.
assistant
No problem, thank you for the information.
user
 Thank you for choosing us.
assistant