Yes, as Roberta says, just be diligent about watering at the right times and be patient. The dried out roots won't get better, but the decent roots will get water to the plant and it will eventually begin making new roots.
As for the petals, wilted petals also won't recover. Your plant was stressed and dehydrated so it will likely drop all its flowers to focus on producing new roots. Enjoy them while the last. Eventually they will all wilt and fall off. When this happens, cut the flower spike off, and just wait. Once your plant has established itself with new roots, it will bloom again!
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