data persistence/multiple step interactions

Other voice assistants can store "session" information that gets sent back and forth. this makes it possible to create an interactive conversation with a back-and-forth as the user and the assistant can steer the interaction into different directions. 

An example of this might be a capsule that does a search and then prompts the user for a filter to narrow down results if a large number of results is returned, or alternatively will ask the user to widen parameters if there are no results. With some kind of session object we could keep track of search parameters in each subsequent request to a backend that will perform the search instead of starting a new search each time