Only KE can give you a seating assignment. You do that by calling. If this is a more than one time situation I'd create an account with KE so you can see things from there. In most cases you have to wait until 90 days out for Bus Class... not too sure if it's different on "coach". After that you can look sometimes look at the seat map if the plane is still showing on Delta and you will see your seats "blanked" out but no indication they are yours... that only occurs on KE if you want to see them. Now our most recent experience was Feb-Mar 2014, so things might be different but we've done it this way for a number of years. Good luck.