Hi.
user
Hello, how can I help you today?
assistant
I want to change my existing reservation, can you help me with that?
user
Sure, may I know your name?
assistant
I am Mark Williams.
user
Ok, please wait a moment.
assistant
OK.
user
Sorry, to inform no reservation found with your name.
assistant
Ok, thanks for your great response.
user
Thanks for choosing us, have a good day.
assistant