Darden Restaurants Inc DRI.N slid 3.9% after the Olive Garden parent reported downbeat first-quarter sales. By Devik Jain and David French Sept 22 (Reuters) - Wall Street's main indexes were on course to post their third straight day of declines on Thursday, as traders sold financial and technology stocks on fears the Federal Reserve's aggressive approach to rein in inflation could trigger a recession. I would expect more volatility as the market digests them, but at the same time we're cautiously optimistic," said Brian Klimke, director ofinvestment researchat Cetera Financial Group.