Key TakeawaysWalgreens shares sank as the U.S. pharmacy chain cuts its dividend nearly in half.CEO Tim Wentworth said reducing the dividend will help boost cash flow and free up funds for strategic investments.First quarter earnings and revenue exceeded estimates, although retail sales declined.Walgreens Boots Alliance (WBA) shares tumbled over 6% in early trading Thursday as the biggest U.S. pharmacy chain slashed its dividend nearly in half, and said it would use the money for other purposes as it faced a ...