Hello.
user
Hello, how can I serve you?
assistant
I would like to change an existing reservation, due to some urgent work. Can you please change my reservation?
user
Sure, I am here to help you.
assistant
Thank you.
user
Can I know your name please to proceed further?
assistant
My name is Stephen Hill.
user
Sorry to inform you that there is no active reservation on your given name.
assistant
That's fine, thank you for your service.
user
Thanks for contacting us.
assistant