Why not just present your users with your FAQ and a search box prior to them chatting with an agent? If most customers write in to support on questions that they would've found answers to via an FAQ, wouldn't that work? You don't need a bot for that, and it's just more load on a customer to try and understand the interface to the bot.
I think bots are going to be big in customer support or in conversations between a customer and a business, but I feel like a lot of bots are being built to try and replace the human connection between customer and the business, which I think is the wrong approach.