Voice computers are the way of the future as evidenced by the popularity of the Amazon Echo, using Alexa.
But did you realize but you probably already have a voice computer.
Your smartphone is a voice computer, and it is a whole lot easier to use than earlier cell phones.
All you need to do in the smartphone is to go to the home screen, tap on the microphone, and say things like
Send a text
Take me home
Tell me how