I want to add a text function for each product when added

I want to add a private message for each of my product like I added a chat function. Can the chat function can be configured to be a private message between buyers and sellers about that specific product? Or the private message plugging can be configured as a communication between buyers and sellers about the specific item listed ? The idea is a way of communication between buyers and sellers about discounted prices(bargain) .is there a plugin that can achieve the description. Pls advise.