Voice Assistant for ticket vending machine

I am conducting a market research for ticket vending machines for a public Transport Company. Could a voice assistent based on snips be applicable (with european gdpr)?

I you have a (Close to market) solution, participate in our challenge: https://www.ioeb-innovationsplattform.at/challenges/detail/fahrkarten-am-automaten-mit-intelligenz-und-hoher-usability/