保证为客户提供的服务质量。识别成功和不成功的订单以及服务失败。收集客户反馈。处理反馈以确保未来的服务质量。 Guaranteeing the quality of service provided to customers. Identify the successful and unsuccessful orders along with the service failures. Collect customer feedback. Process the feedback to ensure the quality of service in the future.