Hi @simonDungeon! welcome to the forum 
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I have seen a number of successful uses of conversational AI in the healthcare space. The team at dialogue are super advanced, also Synaptitude and Tia , a company working on women’s health. Very recently there have been a number of projects (including from the WHO) using Rasa in the context of COVID-19, see here. We also have a sample project called the medicare locator which you might find interesting.
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I think in the health care domain it is especially important to get a lot of advice from clinicians and other specialists who know best, and to involve them closely in the whole process from sharing your first prototypes with test users through to production. Of course in health care it is especially important to follow the relevant ethical standards set by the profession, including how you handle data and when you involve a human in the loop.
Glad to hear you are learning a lot by using Rasa! Keep it up