Where can I get training data related to a domain specific conversation?

Where can I get training data related to a domain specific conversation?

> archive.org/details/usenet

Now almost forgotten, there are 20 years of domain specific conversational data available in Usenet archives (1980–2000), accessible today via Google Groups.

See also my Quora answers to:

• Where can I find a group chat corpus?
• Is there any public data-set for FAQ (Frequently asked questions) in different domains?