The World Economic Forum brings together the best minds in business, politics, social commentary and celebrities. But over the years, WEF has become the apex stage to showcase new technological advances. CNBC Africa's George Ndirangu had a chat with Yoichi Matsuyama, Lead Researcher of the new Socially-Aware Robot Assistant or SARA for short. SARA can detect mood and it can even engage in conversation. Here SARA assisting George.