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From the way you describe it and the fact that you're asking I'd have to say third person omniscient would achieve what you're trying to accomplish. I also think it makes a difference if it's a sh...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/25175 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
From the way you describe it and the fact that you're asking I'd have to say third person omniscient would achieve what you're trying to accomplish. I also think it makes a difference if it's a short dialogue. If the interaction is short than you might want to try portraying the characters in dialogue but if the interaction is not short, and again, because of the fact that you're asking, I'd go with the description of the dialogue as you suggested yourself.