Question: What did a niece of Cissy Houston became a United Nations Global Ambassador for?
Sentence (from "Dionne Warwick"): Dionne Warwick ( ) (born Marie Dionne Warrick; December 12, 1940) is an American singer, actress and television show host, who became a United Nations Global Ambassador for the Food and Agriculture Organization, and a United States Ambassador of Health.
Relevant evidence: Yes