You can structure an unmoderated user test by determining the test objective, writing screener questions to narrow or widen the target audience, and finalizing the test with a survey to gather open-ended feedback. To run an effective unmoderated user test using Voiceflow, set up your prototype with branding and shareability options, add voice input settings for smoother experience, and incorporate a post-experience survey within your conversation design. Unmoderated user testing helps developers gain valuable insights into their conversational experiences, enabling them to make data-driven decisions and improve the overall quality of their products or services.