Ask HN: Any dataset of threaded conversations of everyday work?

I want to get hold of threaded communication that happens at work.

I have taken a look at,

Mailing lists, but mails are elaborate and I want to specifically train a model on shorter day to day conversations. IRC archives don't contain information about the message replied to.

Any open platforms/data sets you have come across where I can find the information containing regular day to day chats?