How can I fetch the coin?

Hint 1 of 5:

If you haven't noticed, the elevator goes down to more floors.

Hint 2 of 5:

Find the floor where the band is playing.

Hint 3 of 5:

Explore the area to the left of the band carefully.

Hint 4 of 5:

Especially look on all of the tables.

Hint 5 of 5:

You will be able to pick up a dice scoop from one of the tables.