Hello.
user
Hello. How can I serve you?
assistant
I am very happy to change my existing reservation because my examination was postponed, now I have much time to prepare for the exam. So please help me in modifying my recent reservation.
user
 Sure,Please wait a while.
assistant
Take your own time.
user
Thanks for your time.
assistant
It's ok.
user
We didn't found any reservation by this name.
assistant
It's not a problem.
user
Can I know your name?
assistant
I am Eric Green.
user
Thank you for choosing us.
assistant
Thanks for checking.
user