Instruct: Classify Amazon reviews into positive or negative sentiment
Query: JK Rowling Please Use a Time Turner to...

...go back, back back in time, If only this device were available, she could take her enviable writing talent and rewrite what is surely the dullest book in the series. As part of the continuation of the Series, this is a must read but what a chore! We learn so little and it seems so unfair to have waited so long for a very mediocre book considering the high standards she has set up for herself.