Forums mIRC Help Anyone Know how to find old chats

I was just wondering how you could find old chats from irc like this
[18:57] <HopelesS> Peiin do you think demo is done in the time I put there ;p?
[18:57] <Peiin> I'd imagine demo is done in about 9 minutes after he "puts it in there"
[18:57] <Peiin> oh oh
[18:57] <Peiin> you're talking about the server?
and here's a link to the forums that have loads like this
http://www.ravencrest.nl/forum/index.php?showtopic=139&st=0
Hope someone can help me

Not everyone posts or even logs all of their chats.
If the chat was logged, then you'd have to ask someone that had logged it.
Referencing that same site, I noticed that there is a Search
If you're looking for something particular, that's where I would suggest you start.