I rcv'd a hydrangea plant at work. Over the weekend it wilted. Is it dead or can I bring it back to life?

It may not be dead just needs water, I received one for Mother's Day and it did the same, Since then I have planted it in the yard on the north side of the house, It does not like hot sun, and now it may be small but it is blooming.and living. I also have a very large blue one under the window unit a/c and it does very well. The water that drips keeps it well watered. The plant is almost 4 feet tall.