Xiaoice is a Microsoft chatbot launched in China in 2014. By mining the Internet for human conversations and differentiating questions from answers using language processing technology, Xiaoice can exchange responses in a way that is both human and current. Notably, it remembers details from previous exchanges with users, such as a breakup with a girlfriend or boyfriend, and asks how the user is feeling. People have told it 'I love you'. The chatbot is currently a text-messaging program, but the hope is to develop a version that includes a Siri-like voice.

Source: http://www.nytimes.com/2015/08/04/science/for-sympathetic-ear-more-chinese-turn-to-smartphone-program.html