Troll, this is how you parse all the nicknames in the channel in a dialog using the didtok command. I wouldn't go for the while loop route like venom suggested, since the didtok is available at your disposal. Why waste it, right? Here is a simple test dialog for your reference:

dialog test {
  title "Testing..."
  size -1 -1 85 16
  option dbu
  text "Roomies:", 3, 2 3 25 8, right
  combo 4, 28 3 53 100, size drop
}
on *:dialog:test:init:0:{
  while ($nick($iif($active ischan,$v1),$0)) { 
    tokenize 32 $1- $v1 
  }
  didtok $dname 4 32 $2-
}
alias roomies { 
  dialog $iif($dialog(test),-v,-md test) test
}

Enter the command: /roomies
And then select the drop-down box to see all the nicknames in the room where you're on. This is for testing purposes only, nothing more.