Dionne Warwick has confirmed that she’s working on a charity track with Chance The Rapper after the pair entertained fans with a friendly back and forth on Twitter last month.The singer was praised in December after jokingly asking Chance about his rap alias.“Hi, @chancetherapper,” Warwick wrote. “If you are very obviously a rapper why did you put it in your stage name? I cannot stop thinking about this.”She followed it up with another tweet that said: “I am now Dionne the Singer,” before adding