The user just says "สวัสดีครับ" which means "Hello" in Thai. They greet. As a customer support assistant, we should respond politely, ask how we can help. No tool usage needed. Just reply.

The user sends a JSON with message "สวัสดีครับ", currentTopic "สวัสดีครับ", draftReply provided. They presumably want a final reply? The instructions: They are a formatter that returns a strict JSON object for the assistant reply and topic decision. So I need to output JSON with reply, changeTopic, newTitle, reason. Since no change of topic; current is "สวัสดีครับ". It's a greeting. They likely want reply. We can use the draftReply. So reply: "สวัสดีครับ! มีอะไรให้ช่วยหรือข้อมูลเพิ่มเติมไหมครับ?" changeTopic: false. newTitle not needed. reason: greeting.