Hi.
user
Hello, how can I help you?
assistant
 I need to change my existing reservation as my exams got postponed, Can you please help me with that?
user
Sure, I am happy to help you. May I know your good name?
assistant
Robert Taylor here.
user
Sorry, there is no active reservation on your name in our records.
assistant
No problem, thanks for the information.
user
Thank you for contacting us.
assistant