Chatbots be they voice or text face the same user interface problems that old school command-line interfaces did 20 years ago before windowing GUIs came about. When you start up, you're faced with a void. it's extremely difficult to convey to users what the acceptable entry points are and how to phrase them to get what you want. The inputs are far more generous than classic command-line world, but it's still vague enough to induce paralysis in end users. If I have a bunch of pull-down menus with clear directives on what I can and can't do, I'm going to be productive much more quickly.
