Chatbots are computer programs that interact with users using natural languages. Just as people use language for human communication, chatbots use natural language to communicate with human users. In this paper, we begin by introducing chatbots and emphasize their need in day-to-day activities. Then we go on to discuss existing chatbot systems, namely ELIZA, ALICE and Siri. We evaluate what we can take from each of the systems and use in our proposed system. Finally, we discuss the proposed system. Our system can be used on Android OS in a similar manner to Siri for effective information retrieval just by speaking various queries
