Is this dialogue OK? Or what would you say?
Person A Has he arrived yet?
Person B. Not yet. Don't worry. He probably just stopped off for something. / He probably just stopped off somewhere.

Question

Is this dialogue OK? Or what would you say?
Person A  Has he arrived yet?
Person B. Not yet. Don't worry. He probably just stopped off for something. / He probably just stopped off somewhere.

Answer

that sounds great, although I don't think I would say He probably just stopped off somewhere"  maybe "he probably stopped off somewhere else"  or more likely, "he probably stopped somewhere else"