Question Answering - how to get Context in real world applications?

Hello Guys,

how do Voice Assistant Devices answer Questions? If we Take a look at SQuaD and other QA Datasets we always get a Question and the Context to answer Questions. But how would this work in the real world?
Would i just parse the Question and use the Wiki Article as a Context or are QA Systems not Suitable for this kinda task?

Ty in advcanded!