Well, now I’m realising that it won’t be as simple as I’ve described. Why? Because if you add sleep_description for the form into your domain as I described, this slot will get filled from whatever user utterance comes first, i.e. from the user’s sleep-confirming answer. You probably want to wait and only fill sleep_description from the utterance that follows. For that, it’s true that you’ll have to add sleep_description dynamically to the form only after sleep_confirm is filled. Have a look at this thread which deals exactly with this issue 