Just to amplify what adpiucf said: I distinctly remember my "sponsor" (the girl who pushed for me throughout rush at ASA) coming over and pulling me out of conversations because "we need for you to meet as many people as possible". Her friends did the same thing -- we would be having a great talk, and they''d all of a sudden say "well, I don't want to end this, but we really need you to meet as many people as possible!" and bring me over to others.
Put this way, you feel a lot better about it, and not just "dumped".
Especially in early rounds, when the PNMs are unsure what's going on, make sure they know that "passing them on" is for their benefit, not because you've become bored talking to them.
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