Interact on user-level possibly?

Hi,

In our commerce-funnnel (step 1 > 5) we have drop from 100%(1) to 2%(5).

Clickstream:

Adwords
Visitor search for product (step1)
Visitor compare suppliers (step2)
Visitor makes decision (step3)
Visitor fills in form (step4)
Visitor goes to paymentgateway (step5)

First i want to reduce the % between step3 and step4, the idea is
through an dymanic pop-up when the visitor ‘needs’ some advice in making
the decision. The visitor gets dymanic a pop-up box with an chat
function with our agents.

Someone ideas in case of setup/plugins/gems?

Grtz…remco