Try this code:

Code:
ON *:TEXT:*:?: {
  if (!$($+(%,private,_,$nick),2)) { set $+(%,private,_,$nick) 1 | timer 1 5 msg $nick hello }
  elseif ($($+(%,private,_,$nick),2) == 1) { set $+(%,private,_,$nick) 2 | timer 1 15 msg $nick I'm busy, sorry }
  elseif ($($+(%,private,_,$nick),2) == 2) { set $+(%,private,_,$nick) 3 | timer 1 15 msg $nick I cannot contact you now, sorry }
  elseif ($($+(%,private,_,$nick),2) == 3) { set $+(%,private,_,$nick) 4 | timer 1 15 msg $nick I am on the sex mode now, sorry }
}

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