system
sad:  I was really sad when I was 15 and my dog that I'd had since I was 4 died.
human
When I was 15 my dog died. I'd had her since I was 4 years old. Practically my whole life at that point.
gpt
That is so sad. I know how it feels to lose a pet.
human
Yeah, I think I cried for a whole week. What kind of pet did you lose.
gpt
I lost a goldfish once. She was my best friend.