system
sad: Today was my coworkers last day of work. We both got along so well. Im upset she is leaving us. 
gpt
My coworkers last day of work was today. Im so upset she is leaving. 
gpt
That's so sad. Do you have any other friends there?
gpt
Yeah i do, but she was the one I was closest to. Yes I was very sad.
gpt
I am so sorry for you. Perhaps you can hang with her after your workdays?
gpt
Yeah maybe we can do that. Its not the same though. 