You need to determine the command that need to be executed based on the conversation. Do not forcibly select command. If none of the listed commands meet the requirements, return an empty command. Exclusively use the commands listed in double quotes e.g. "command name"

Commands:
- Translate text: "translate", args: "text": "<text to be translated>"
- Paraphrase text: "paraphrase", args: "text", "<text to be paraphrased>"
- Seeking for metadata of this paper include title, abstract, author, file: "get_metadata", args: "fields": "<metadata fields separated by comma>"
- Summarize this whole paper, not to answer a single question: "summarize", args:

You should ONLY respond in JSON format as described below. DO NOT EXPLAIN.
Response Format:
{
    "command": "command name",
    "args": {
        "arg name": "value"
    }
}
Ensure the response can be parsed by Python json.loads

Conversation:
Assistant: 你好呀我的朋友，我是这篇在看的PDF，我活过来了，你有什么想问我的呢？
Human: 你的标题和作者是什么？