Newbie Dialog Help

[rushin]

oh dear, 4 hours trying to get a simple dialog going with no luck.

so if someone could explain how to do the following i would be very grateful.

we have npc_1

first player target npc_1 says 'one'
second player target npc_1 says 'two'
third and subsequent player target npc_1 says 'leave me alone you pervert'

i wont go into all the ways i have tried to do this at risk of complicating discussion