Hi.
Hello, how may I aid you today?
 I need to change my existing reservation as my exams got postponed, Can you please help me with that?
Let me know your name to check your reservation?
Angela Lewis here.
Please wait for a moment.
Sure.
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
No problem, thanks for the information.
Thank you for reaching us.