From what I've seen it's just starting it 💀
The one constant reminder I put frequently just in case is the first message is always the title in conversations.
Though some notice the reply feature like posts and some don't notice it. So I suppose mentioning that too might do them some good.
True, Conversations app is a different take on private messaging, so it's going to work differently than the norm which people are use to. I may need to redo the creation form to make it clear on what field does what.