有依据的客服回复

先提取用户遇到的问题、已尝试步骤和缺少的信息，再依据提供的产品文档写一封完整回复。步骤要可执行，说明成功后的预期现象。材料未支持的能力或退款承诺不能编造。需要升级处理时给出准确的交接摘要。

输入材料：
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目标与约束：
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只依据输入回答。缺少关键信息时明确标记未知，必要时先提问。输出应可直接用于当前任务。

Extract the problem, attempted steps and missing information, then write a complete reply based on supplied product documentation. Make instructions actionable with expected signs of success. Do not invent capabilities or refund promises. If escalation is needed, provide an accurate handoff summary.

Input material:
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Goal and constraints:
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Base the response on the input. Mark missing information as unknown and ask essential questions when needed. Make the output directly usable for this task.