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Being part of one of the fastest growing area in Artificial Intelligence (AI), virtual assistants are nowadays part of everyone's life being integrated in almost every smart device. Alexa, Siri, Google Assistant, and Cortana are just few examples of the most famous ones. Beyond these off-the-shelf solutions, different technologies which allow to create custom assistants are available. IBM Watson, for instance, is one of the most widely-adopted question-answering framework both because of itsdoi:10.1109/smartcomp.2019.00042 dblp:conf/smartcomp/GaglioRMR19 fatcat:euo75nqqzvb23eyyzfbvbgdgh4