Reset conversation nodes clear the working/faulty state of all visited symptoms, the accepted/rejected state of all visited solutions, and any answers provided for conditions.
This allows users to work on multiple requests in the same conversation. If they have more than one problem or question, they can get their first solution or answer and then start fresh with the second. The session history is not cleared, so nothing will be missing from the transcript. If the user passes through this node accidentally, they can hit the "Previous" button in the assistant to return to the previous node and restore their previous symptoms, solutions, and conditions.
A restart node is similar to a reset conversation node, but also jumps directly to the flow's start node. If you don't need to jump to a different part of the flow, it may be more clear to use a restart node instead.
Note that form data is not cleared by a reset conversation node. If you need certain form data fields to be cleared, you can do so with a write data node.