Hi.
Hello, how may I help you?
 I need to change my existing reservation as my exams got postponed, Can you please help me with that?
Sure, I am here to help you with that, can I know your good name to proceed further?
Helen Nelson here.
 I am very sorry to inform you that there is no reservation found under your name in our database.
No issue, thanks for the information.
Thank you for reaching us.