Voice user interfaces are in no way a new phenomenon. Siri has been on the market since 2011. However, with the seemingly omnipresent advertising for Amazon Echo, the topic is now more relevant than ever. Competitors of the Echo are very active in this field, too. Google with Assistant, Microsoft with Cortana and Facebook with their Messenger M are vying for consumer favour. Consequently, graphic interfaces are being increasingly replaced by or only used in conjunction with voice user interfaces, as speech has been the simplest and most used form of communication for millennia. Even today, voice user interfaces are not without their faults.