BBS has got it right. Be upfront with Company A, and tell him you need to decide this week. If he thinks you're "the guy" he'll do a phone interview and at minimum give you a clear indication if he wants you. If after the phone interview he gives you buying signals you can decide or schedule the face to face during your lunch break or early/late in the day next week. If he blows you off, then it wasn't meant to be and you've got job B.
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