We booked on Delta SMF-LAX-LIM-CUZ, and were able to select seats on the two LATAM segments by using the LATAM confirmation number on the LATAM website. Then, Delta changed their schedule, and we were reaccommodated via ATL. I tried going to the LATAM website to get seats on the two new segments (ATL-LIM and LIM-CUZ), but that won’t work now—there’s an error message suggesting to try again later.

So, I call LATAM, and the agent says I will not be able to get seats until 48 hours before the flight, but that I shouldn’t worry—that we will be assigned appropriate seats (we had paid extra for exit rows on the original overnight segment LAX-LIM). Does this advice sound correct?