(Reuters) -Lyft's price cuts may have helped the ride-hailing firm make a small dent in Uber's U.S. market share, but not enough to prevent the bigger rival from reporting its second quarterly operating profit. After the slowest sales increase in the second quarter in two years, Lyft is expected to post a bigger growth story in the September quarter as it attracted more riders with lower prices. The average price of a standard Lyft ride as of September-end was more than 4% cheaper than Uber's similar service, according to data analytics firm YipitData, a big change since February, when both the companies were charging nearly the same price.