I'm sure this is technically possible, but it may never be practical. Much like human operators, you're going to want to drive the user down a certain path, because order is often extremely important.

What if Dominoes doesn't have green peppers? What if they don't like the pizza brand? What if they're asking because they have a coupon? You may end up repeating sections of the conversation multiple times, and in the end the user will just end up so confused they give up.