1) The "word" is that you cannot request a dining room.
. . . the ASSIGNER assigns the table through his/her tablet
. . . the assignment is transmitted to the SEATER, who guides you to the table
2) However, you can make a Request at the podium when you check-in.
3) The SEATER, if they want to make the effort, can request it to the ASSIGNER.
4) Just be extra-special-nice to the podium person --- the can be your friend.
5) For lunch, you pretty much seat yourself, so rooms are not a problem.