answer: #Person2# is telling #Person1# about Bulletin Board Service. #Person1# wants to try later.
documents: #Person1#: Do you know what the BBS is?
  #Person2#: Sure.
  #Person1#: Tell me then.
  #Person2#: BBS means Bulletin Board Service.
  #Person1#: Oh, I see, but what's it used for?
  #Person2#: A lot of things!
  #Person1#: Tell me in details.
  #Person2#: Okay. BBS, an online service, offers a wide variety of online games, files, one-on-one chat, message areas, private mail, and participate forums.
  #Person1#: Oh, that's great. I want to try later.
  #Person2#: Why not?