chat_history: ['As I look at my 21 year old son, I often reflect on when he was smaller. Time really flies!', 'Time sure does fly and change is inevitable', "Yes, that's true. I still can imagine when he was waking up Christmas morning to see what Santa brought when he was 5."]
sys_response: Thinking about past events can be very nostalgic
situation: My son is now in college and of legal age for any situation. I feel very nostalgic when I look at him at times.