Response API: keep track of previous conversations, resume or create a new one

[testermax]

Hi,
what is the best way to keep track of previous conversations for multiple users? I know I can get the last message by calling GetResponseAsync(resp_id), but this only gives me back the last response, not the entire conversation. What is the suggested approach?

Also, I want to be able to start a new conversation, without any history. How is this solved in the correct way? Should I just create a new Response as usual, or is it a special way to mark this as a new conversation?

I like that the responses api is stateful, but it is not obvious how to handle these states I think.