## Turn 1

The user asks: "Use only these sources. [S1] The service warranty lasts 24 months for residential customers. [S2] Commercial customers receive 12 months of warranty. [S3] Batteries are excluded after 6 months. Question: What warranty applies to a residential customer? Answer with a citation like [S1]."

We need to answer: The warranty for a residential customer is 24 months. Cite [S1]. So answer: "The service warranty lasts 24 months for residential customers [S1]."

We must follow output format: just the answer with citation. No extra commentary.