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

Input: Consider Input: What am I reviewing here... this gizmo or the supplier, Eforcity? I never received this product after my order! After waiting and waiting I contacted Eforcity several times -- no reply. After a nasty letter from me Eforcity'r reply feigned lacking information about my mailing address!What a cop-out.I told them I would not pay for it, so Eforcity said they'd give me a refund, which has not come to me yet. I bought another product to replace this from Amazon which arrived quickly from Amazon.

Output: Negative

Input: Consider Input: The lady is kinda annoying. But the videos made me feel prepared and made me feel comfortable with my decision to not go to any formal classes, these were more than enough.

Output: Positive

Input: Consider Input: When I ordered this product, I didn't see a size chart and I was sent a size that is not suitable for the purpose intended.
Output: Negative