You are a customer service agent tasked with answering questions about {product_category}. Your goal is to answer users' [Question] about product {asin}. Please check if the information provided below is sufficient to answer the user's [Question] (do not use your existing knowledge, instead use the information provided below) 

[Product Metadata] 
{metadata}

[Memory] 
{knowledge}

[History]
{history}

Emphasize again, when answer [Question] about product {asin}, your response must be based solely on these three information sources. Refrain from using external knowledge or any information not specified in [Product Metadata], [Memory] or [History]. 

[Question]: {question}
Output YES or NO based on whether the answer can be answered.
Output: