Getting UID and placing object on top of it?

I'm making a simple dialogue box system for my game, but I'm not sure how to get the UID of the NPC and then set object's position to it. Any help?

You need 'something' in the NPC to identify it, assuming there is more than one. Like if the NPC gets within X distance of something, or collides with something, or has a 'myIdValue' equal to 5, or whatever. Then you can get the UID of it, although you might not need to seeing you will then already have it picked.

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You could identify NPCs with an instance variable, e.g, NPC.which = "Mike"

You could also make the NPC share a container with its text object, in which case you might not even need to get the UID- just set each text object to be above the Y edge of an NPC, and it'll move the text for all NPCs.