Given the task definition and input, reply with output. Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Using this air bed was a nightmare to my husband. It is not firm and loses air easily. It lost half of the air in 30 minutes. When my husband got up from this bed in the morning, he was almost on the floor. He slept as a curve during the night, which really hurt his waist, which affect his movement. Definitely will return to Amazon today.
Negative