Looking for a Shopify Shop Message App

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For Shopify Conversations: If anyone is familiar with Etsy's "Messages" (formerly called Convos) which is essentially a section of your shop that runs posts between the customer/ potential customer and seller. These posts remain in the seller's shop messages indefinitely. Images can also be uploaded.
My question: Is there a Shopify app (preferably free) that functions in the same way? Not an instant messaging app, where customers are waiting for an instant reply but more like a private message forum for my shop.
I'm not looking for an app that integrates with email or social accts. (facebook, etc) but is just integrated into my Shopify store. Can anyone point me in the right direction?