Question: when did the last episode of star trek voyager air
[{'answer': 'May 23 , 2001'}, {'provenance': [{'wikipedia_id': '963205', 'title': 'Endgame (Star Trek: Voyager)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 370, 'bleu_score': 0.860903740608123, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8074055152508370445}, 'section': 'Section::::Abstract.'}]}]