Startup Idea : Web salesman/advisor

I think that it would be great to create web application, that for a small fee would provide advisor. For example lets imagine an eshop with computers. Typical customer don't see which one he wants to buy, but there is a person he can chat with. Eshop can also acquire some additional data about their customers and why they want some products. The difference between this and contact form would be, that conversation would be inicialized by an application and not customer. Customer is free to ignore it. When customer replies then the adviser is bind to him.