Hello. I am Jeffrey Roberts.
user
Hello, how may I serve you at this moment?
assistant
I want to change an existing reservation, so please help me in changing the reservation.
user
Sure, we are here to help you. Please wait for a while.
assistant
Ok.
user
Sorry we did not find any reservation with your name.
assistant
Not an issue. Thank you.
user
Thank you for choosing us.
assistant