on *:OPEN:?:*:{ .msg $nick I'm not current accepting queries, sorry (Auto Message) close -m $nick | .ignore -pnu30 $nick 3 }
The /close -m $nick closes the private message window with the nickname who message'd you. The /ignore -pnu30 ignores their private messages and notices for the next 30 seconds, then automatically removes the ignore (to prevent flooding).