Hey, where is "blank" (another close by local bar)? I am supposed to meet a friend, either here or there but he got caught up at work." then you can stay or bounce at your option.
Also, my buddy uses this one in bars. Only bars... He says, I'm waiting for a friend, and until he arrives I'm looking for some good conversation. If she says yes, and they usually do, he buys her a drink. This guy is a star PUA and he knows all the rules, but for some reason in this situation, it works like a charm.