A customer left a review. We follow up with anyone who appears unhappy. Extract all entities mentioned. For each entity:
- classify sentiment as ["POSITIVE", "NEUTRAL", "NEGATIVE"]
- determine if the customer requires a follow-up: Y or N
- reason for requiring follow-up

Return JSON ONLY. No other text outside the JSON. JSON format:
{
  entities: [{"entity_name": <entity name>, "entity_type": <entity type>,
  "entity_sentiment": <entity sentiment>,
  "followup": <Y or N for follow-up>,
  "followup_reason": <reason for follow-up>
  }]
}

Review: "The product's quality was poor, and customer service was useless. I was quite unsatisfied with my experience."