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How To Let LLM Output Nothing

We harded coded a stop sequence in LLM: NO_RESPONSE_NEEDED. Whenever this sequence is met, the response generation would stop. You can then prompt the LLM to output nothing by writing something like: 
- if user's name is John, reply exactly the following: "NO_RESPONSE_NEEDED".
This can be useful when you wish for agent to not respond in certain situations (like being put on hold, like call not connected, like dealing with answering machines like Voicemail instructions).