Hi.
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. May I know your name?
assistant
I am Samantha Wright.
user
 Sorry, we found no reservation on your given name.
assistant
Not a problem, thank you for the information.
user
 Thank you for reaching us.
assistant