### Answer
The behavior you're observing where the assistant retains knowledge from previous conversations typically relates to how the assistant's memory and context management are configured. Vapi does allow developers to manage the state and context between sessions, which can be used to create a more seamless and personalized user experience.
In Vapi, this can be handled by storing certain information across calls or setting up the assistant to manage context more dynamically. The configuration details for managing conversation states or context are not directly covered in the provided documentation, but these capabilities generally depend on the design of the assistant and how it is programmed to handle session data.
If you're looking to manage or modify how the assistant handles user data across different sessions, you might need to look into the assistant's configuration settings or the logic implemented for handling session data. This typically involves programming the assistant to either forget certain information after a call ends or to maintain it based on specific criteria.
For more specific guidance on configuring these aspects, you might need to consult the specific implementation details of your assistant or the platform documentation for handling state and context.