(S (S (BASENP (NNP Uka)) (VP (VP (VP (VBD approached) (BASENP (DT a) (NNP USAF) (NN bus))) (PP (IN at) (BASENP (DT the) (NN airport)))) (COMMA ,) (S (VP (VP (VBG asking) (BASENP (DT a) (NN serviceman))) (PP (IN for) (BASENP (DT a) (NN cigarette))))))) (PERIOD .))