Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
Needs to be pumped up at least twice in the night. High rise makes it easy for older people to use.UPDATE:Amazon was outstanding. I wrote saying that the bed was leaking too much to be comfortable.. an immediate replacemnt was sent and i printed out a free shipping label online.The new bed is perfect.. three kids slept on it together and they were fast asleep when i checked later.I left the airbed out next two days and no air had leaked yet.I was lucky I think to have got a good piece.Thank you Amazon.
Answer:
Positive