chat_history: ['Rolling down a huge downhill street with no brakes was fun but nervewracking', 'Whoa!  What were you driving that had no brakes?', "I found a bike on the side of the road but didn't test it before coasting down this hill"]
sys_response: That sounds quite scary!  Did everything turn out OK?
situation: Rolling down a huge downhill street with no brakes was fun but nervewracking