I also remind them that if they have a special meal booked, an change seat, it is their responsibility to advise the crew of their new location.
Indeed
TightSlot "Special Meal-Gate"... The following furore that follows when someone has moved 20 rows down the aircraft and expects us to know by telepathy that their special meal now needs to be delivered to a new location... Of course, it is my fault because I should know which, out of the 235 seats in D and E zone that person has moved to.