The Philadelphia-based retailer reported second-quarter comparable sales growth of 4 percent on Monday, lower than the 4.3 percent rise analysts on average had expected, according to research firm Consensus Metrix. Urban Outfitters’ shares initially rose as much as 10 percent in extended trading after it reported a better-than-expected quarterly profit, but fell nearly 7 percent when Chief Financial Officer Frank Conforti said sales were slower so far in August.