Hi.
user
Hello, How can I best serve you today?
assistant
I need to change my existing reservation as my exams got postponed, Can you please help me with that?
user
Sure, I am here to help you with that, can I know your good name to proceed further?
assistant
Angela Green here.
user
 I am very sorry to inform you that there is no reservation found under your name in our database.
assistant
No issue, thanks for the information.
user
Thank you for choosing us.
assistant