I assume this was pre-allocation? If so, don't panic. A third, I think, of CW seats are not pre-allocated. If you check-in online at -23hrs 59mins you are 99.99% certain to get two seats together.

If you have just checked in on-line and this is the best they have, then you are a bit stuffed. I can't see anyone switching a window in a two-block to an aisle in a four-block.