Skip a form question based on user input

edit: after reviewing this post, an idea came to mind - to set the slot value to something other than None. As such, I modified my class as follows:

 def run(self, dispatcher, tracker, domain):
        current_slot = tracker.get_slot('requested_slot')
        return [SlotSet(current_slot, 'Skipped')]

This fixes the issue, and lets me write custom messages for skipped users.