One to one chat feature in ASP.net mvc web application using entity framework

I have an asp.net mvc website developed and now I want chat feature between users. It's an ecommerce website where there are workers and customers. - Once an order is picked, there should be a button in dashboard (created already) to chat with worker and customer. - An admin can moderate all chats between users on the site and enter any chat, as well as remove workers from the chat. - Chat should be saved with timestamps in MSSQL database, and should use entity framework code first to be consistent with the entire website. - chat should be closed once an order has been completed. Please message me ASAP with time frame and what methods you will use to achieve this, I coded the entire application but I'm sort on time.