Depends on how you say it, Examples..... (The dining staff are all in the kitchen.) or... (The dining staff is going to do the honor.)
Dining staff need to be professional and have good customer service. They need to help keep the kitchen neat and clean. They need to be professional when they interact with other staff.
Dining room is correct.
staff are
The staff was is correct
You spelled it correctly: dining
correct
is there othere staff
The correct spelling is "dining".
The correct spelling is restaurant (eatery, dining place).
The correct spelling is restaurant (eatery, dining place).
All staff are invited would be considered correct in English usage. American usage may be different.
No, the word 'staff' is plural, therefore the staff 'are' here.