With the last evolution of the web, several new means of communication have showed up. In the commercial domain, chatbot tech-nologies are now considered as essential for providing a wide range of ser-vices (e.g. search, FAQ, assistance) to the end-user, and to make a client a faithful customer. In this paper, we propose an on-going work on the denition and implementation of SynchroBot, an ontology-based chat-bot that relies on Semantic Web and NLP models and technologies to support user-machine dialogical interaction in the e-commerce domain.