I think that it's not possible. You can, however, do what you want once the dialog box is open (repairing, choosing a quest reward, reading some storyline, buying items, etc...). But talking to NPCs is some of those "3D world" things, and even if you already have him or her targeted, there is no command to open the dialog box (to my knowledge, and I think I've read other people saying the same here and there).
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