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

Problem: The product deflated during the night. We refilled and let sit with no one in it for a while and it still lost air. I was very disappointed as the product initially started great for my Aunt who would not have been able to be on the floor with a traditional air mattress. I am attempting an exchange hoping it was just this one item. Most of the reviews were glowing and I am hoping that the replacement will perform as the other reviews indicated.
Solution: Negative