A man used a hatchet to attack three people inside a McDonald’s restaurant in Chicago after a cashier refused to give him free food Sunday morning, police said. The terrifying incident took place shortly before 8:30 a.m. at the fast-food eatery on the city’s Southwest Side. Cops who responded to a 911 call found two 45-year-old women and an 18-year-old man with stab wounds, WLS-TV said. One of the women was hospitalized in serious condition and the other victims were in good condition, according to WBBM-TV. It’s unclear if they were employees, customers or both. The assailant, who was wearing …