System : Pick by comparison
Select the object to compare and which parameter from the object to compare (x, y, variable,...), in your case the boolean that determine if the NPC is talking, equal to 1 if true, equal to 0 if false;
All the actions next to this condition will pick this specific object;
Don't forget to compare the family and not the individual object so it can pick any object in the family that meet the condition;
Also I still recommend you to read the manual