Try use this code:

Code:
ON *:TEXT:*:?: {
  if (!$($+(%,private,_,$nick),2)) { set $+(%,private,_,$nick) 1 | timer 1 5 msg $nick hello }
  else { set $+(%,private,_,$nick) 2 | timer 1 15 msg $nick I'm busy, sorry }
}

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