system
grateful: I'm so lucky that I have had a best friend for 20 years. 
human
My best friend and I have been friends for over 20 years. I feel really lucky to have such a great friend.
gpt
That's so great! You guys have been able to stay close after so long! You must be very compatible with each other
human
we really are, we live over 500 miles apart now yet still best friends, it's pretty cool. 
gpt
Amazing! I wish I had some friends like that in my life