21:A: the sign says this is reserved parking only and your student parking sticker has expired, too.
B: I was just running in to turn in a paper, officer. I haven't been here for more than five minutes.
student parking sticker = a permit for parking in campus, here, sticker = permit, so that one can put "sticker" to his/her car easily (put that sticker on window or outside of a car somwhere; just make others see it easily).
B got two things wrong. 1. he cannot park his car in "reserved parking area"/ 2) his car's "student parking sticker" has expired. (he needs to renew his "student parking sticker". B might need to pay for renew that"sticker".
what B said is trying to tell A that B wasn't real parking there and definitely B doesn't want to get a ticket.
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