Could you please tell me the name of the white berry-like foliage used in this arrangement?
I believe the flower and foliage you are trying to identify is a plant called either Japanese pieris or Japanese andromeda. The botanical name is Pieris japonica.
It’s a broadleaf evergreen shrub that sets those long panicles of bell-shaped flowers in late winter to early spring. In nature they can be quite fragrant but I am not sure how long the fragrance holds up in arrangements. I did post a few pictures of one such Pieris japonica on the HSNY blog last spring when it was in bloom in Central Park. That might help to confirm further. Here is the link to that entry, (they are the last images on the post):