Andy Reid and the Kansas City Chiefs should be quite familiar by now. The two sides spent much of Thursday in negotiations for Reid to become the Chiefs’ coach, a person familiar with the situation told The Associated Press. The discussions followed nine hours of talks Wednesday that went well enough that Reid canceled plans to interview for other openings. It was unclear which details were preventing the two sides from reaching an agreement. The search for Kansas City’s next coach has been led by Chiefs chairman Clark Hunt and team president Mark Donovan, who has a connection to Reid after spending six seasons as the Eagles’ senior vice president of business operations.