They are both OK. "Any seats" is better if only for the parallelism with the other "seats" in the sentence. Also, "a seat" is slightly pejorative, sounding a bit like "a single seat".
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They are both OK. "Any seats" is better if only for the parallelism with the other "seats" in the sentence. Also, "a seat" is slightly pejorative, sounding a bit like "a single seat".