A user persona is a specific, but brief, description of the type of user who will interact with your voice app. Think of a few people you expect to use your skill or action. Try to have 2-3 different types, e.g., a millenial vs a working parent. These user personas will help you avoid designing only for yourself and your goals. This ultimately helps you create authentic dialogs and more engaging experiences for customers. (Source: Google design guidelines)