Hello.
user
Hello, how may I support you?
assistant
I am Patrick Walker, I want change my recent  reservation as my exams has been postponed. Help me in changing my reservation.
user
Sure, let me check the current status and revert you.
assistant
Sure.
user
We hardly tried to find your reservation but, no reservation has been found with your name.
assistant
Its ok, thank you.
user
Thank you for opting us.
assistant