Don't quote me on this..but when you put a deposit on your cruise as I've done with Princess the last 10 years..your TA. will ask your dining preference and book that with your ships details..for instance we always..go to 2nd seating fixed..and we request this specifically with our TA..so it's all on your documents approx 2 weeks before you sail..or you can check online on "Princess personalizer" on the site
www.Princess.com..so that's what you should do to declare your dining requests..start with your TA.I've never not had a Travel Agent ask what seating we wanted....Good luck..Happy sailing..:daisy..Joanne