Hello.
Hello. How can I help you?
Due to sudden change in my exam dates I need to change my existing reservation. Can you help me in changing my reservation?
Ok, may I know your good name?
I am Pamela Wilson.
 Please wait I will check and revert you in a moment.
Sure.
Thanks for waiting. Sorry to inform you that no reservation was found on your name.
No problem. Thank you for the information.
 Thank you for contacting us.