Hello,.
Hello. How can I help you today?
Can you please help me in changing my existing reservation, as my exam got postponed.
Sure, I am here to help you with that, can I know your good name to proceed further?
Sure, myself Gary Clark.
 I am very sorry to inform you that there is no reservation found under your name in our database.
Ok, no issues. Thank you for your help.
Thank you for reaching us.