chat_history: ['One time my mom bought an ice cream from Mcdonalds!', 'Really? what kind of icecream?', 'A plain vanilla one. It is rare since their machine is always broken!']
sys_response: That is a good one! it is not always broken though. Sometimes they are out of ice cream mix because the workers eat it all
situation: One time my mom bought an ice cream from Mcdonalds!