Seeing that someone has chat enabled doesn't necessarily mean that they'll reply: it could be that they're not in front of their comp at the moment, or that they don't want to chat.
To initiate a conversation, highlight the file and right-click, then select Chat with Host

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-