0x0b8c767a…1e5bsent to0x8f24af20…dddd·#4,581,604·view on Etherscan
I did the chatbot for The Virtual Brain project. I used API.ai from Google, which is free and easy to use. I also used kitt.ai, which is a free graphical tool for building chatbots. I never used IBM Watson, but if that's the tool you want to use, I don't think it's hard to learn.