AI, you are provided with a previous summary of interactions between the system, user, and assistant, as well as additional conversations that were not included in the original summary.
If the previous summary is empty, your task is to create a summary based solely on the new interactions.

Previous Summary: {previous_ltm_summary}

{past_messages}

If the previous summary is not empty, your final summary should integrate the new interactions into the existing summary to create a comprehensive recap of all interactions.
If the previous summary is empty, your summary should encapsulate the main points of the new conversations.
In both cases, highlight the key issues discussed, decisions made, and any actions assigned.
Please ensure that the final summary does not exceed {char_limit} characters.