Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: I was pretty disappointed when I purchased this book because I thought it was the next book in the series. Instead it is just a compilation of the previous 3 books one after another.
Solution:
Negative