system
sentimental: I went to the race track. We used to go there with my grandparents when we were kids. It made me think of them. 
gpt
I went to the race track. Since we used to go there with my grandparents, it brought back a lot of memories. 
human
That's so funny, I was just looking at the racing schedule yesterday! I love races- if you are talking about horse races. And good memories are the best. 
gpt
They were the horse races. My grandparents went twice a week. 
human
Did they used to take you? They can be so exciting. 