system
nostalgic: My old high school friend called me out of no where today and we talked about the times we had in school.
gpt
My old friend suprised me with a phone call today. I have not heard from her since high school. 
human
How lovely!  I such it was so nostalgic to talk about old times together.
gpt
Yes it was. I cant wait for our reunion so we can catch up on more!
human
That is a brilliant idea.  There is nothing better than catching up with old friends.
gpt
Yes the things we remember and ponder about are the greatest!