We took a small stab at this at Alexa a few years ago with Follow-up Mode (default off, you have to enable it in the settings since that continued listening sho

We took a small stab at this at Alexa a few years ago with Follow-up Mode (default off, you have to enable it in the settings since that continued listening should be up to the customer) that allows you to keep interacting with Alexa for "follow-up" utterances to know when you're done with the conversation, but it's not quite the same as just allowing for a single run on utterance or set of commands in quick succession, just turn taking without the need for a wakeword for the next interaction. Alexa determines you're done with some set keywords like "thank you" and stops listening, as well as using ML to understand when you're not talking to her anymore.