chat_history: ['So I lost 20 lbs onmy diet and last night I ate a whole large pizza!', 'Wow! Well a cheat day here and there might be okay! Haha', 'I agree. I feel bad for doing so!']
sys_response: Right, but I'd say once isn't too bad as long you stay on track.
situation: I have been doing very well on my diet and last night I decided to eat a whole large pizza by myself!