Hi, I am Helen Taylor.
Hello, Helen Taylor, how may I help you out?
I need to cancel my recent reservation for  postponing of my exams,Could you please help me in doing that?
Sure, we are here to help you. Please wait for a minute.
Sure.
Sorry for your inconvenience, we did not find any reservation based on your name.
No problem, Thank you for helping me?
It's my pleasure to help you.