dtrs20

we check into our cruise in about 14 hours but my 2nd guest, last minute literally a few hours ago, told us she can't go because of work. after 3 hours I found someone who would be willing but at that time I could not go and change my 2nd guest name. I tried calling and they said I can't change anything because the manifest was sent out already. am I able to change her name to my new guests' name at the ship through guest services? is there a fee? this was all very last minute and rushed. thanks !