Yes actually there is a solution for this although it is not an elegant one. I’m working to update the Instagram course to fix this issue. Basically you have a list of conversations that shows only the conversations between you and that user(s). The conversation is shown as a button identical to the one that creates a new conversation however the visibility is determined by the count of the conversations you share between you. If it’s less than 1, the button for creating a conversation shows. If it’s 1 or more, the list of conversations shows with only one item. Clicking it takes you to the current conversation.