void main()
{

object oPC = GetEnteringObject();

if (!GetIsPC(oPC)) return;

int DoOnce = GetLocalInt(oPC, GetTag(OBJECT_SELF));

if (DoOnce==TRUE) return;

SetLocalInt(oPC, GetTag(OBJECT_SELF), TRUE);

object oTarget;
oTarget = GetObjectByTag("sas13");

AssignCommand(oTarget, ActionStartConversation(oPC, "sas13"));

}