Swop is a variant word for swap. It simply means to exchange something for another. The prompt is a polite way to ask for a swap.
This reminds me of the kind of swap deals I make with my phone. I swap my phone to get an upgraded version anytime I see that I need a new device.
Swapping is not really easy though, you have to be sure the other party wants to swap too. Hence, the question we started with. This reminds of the barter system and the problem of double coincidence of wants.
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