Hi.
Hello. How may I aid you?
I want to cancel my sister's reservation because she have exam next month. Can you please help me?
Sure, I am here to aid you. Can you please tell me your sister's name?
Her name is Sarah Collins.
Ok, please wait a minute. I will check and get back to you.
Sure.
Sorry to inform you that, there is no reservation found on your sister's name in our database  to cancel.
No problem, thank you for checking.
You are welcome.