Hi.
user
Hello, how can I help you at present?
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 Emily Walker.
user
Sorry to say that, there is no active reservation found on your name.
assistant
Not a problem, thank you for the information.
user
Thank you for choosing us.
assistant