separate chat flow or chat question based on URL

I need help on following case: 
We want to setup different kind of chat window / chat flow based on page from which chat is started
Case 1: Sell page
We want to ask first whether you are type A or type B and than if type A reply with some article and if type B refer to Agent

Case 2:type A in session
We already know it is type A so we want to send further decision questions and if not resolved then refer to agent for chat

Case 3: type B in session page
Here we already know that it is type B so we want to directly start chat