Natural dialog conversation between humans and machines is a flourishing topic of the modern world, now show off their presence across a range of daily use devices and digital assistants. This is tried to be achieved by using sub-field of Artificial Intelligence named Natural Language Processing. The task is to be practically implemented through a series of convenient and capable categories by some of the market leaders with their successful products named the Amazon ALEXA, Microsoft CORTANA, Google ASSISTANT, Apple SIRI to quote a few. A virtual assistant put to real world usage has to perfectly emulate a human dialogue, analyze the input given by a user, represent the same correctly, convert to its process able form and formulate a relevant and appropriate response. In this paper, we review a few market leading voice based chat bots, identifying their technical aspects along with their advantages and disadvantages during the practical usage.

Chat bots, NLP (Natural Language Processing), CI (Conversational Interfaces), ALEXA, SIRI, Google ASSISTANT, Microsoft CORTANA)

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