That usually happens after a clear answer, confirmation, or next-step action has been provided. If the user does not continue, the bot should avoid filling silence with extra messages or repetition. Stopping also depends on confidence signals like resolved queries, completed tasks, or explicit goodbye cues. Good conversational design treats silence as success, not failure, once value has already been delivered. Over-talking can reduce trust, so the endpoint is usefulness, not maximum message count per session.