Dear XXX,
I had an interview with two candicates this morning who both had a good knowledge of business and skill ,which I'm fairy satisfied.In my opinion ,they both are competent at the position in need ,even one of whom is kind of overqualified.But owing to the fact we only need one ,so I cant decide on whom to choose and report it to boss who agree to interview them in person.So would you please arrange an another interview at appropriate time next week?
Yours .XXX,