Question: when did touched by an angel first air
[{'answer': 'September 21 , 1994', 'provenance': [{'wikipedia_id': '510590', 'title': 'Touched by an Angel', 'start_paragraph_id': 1, 'start_character': 97, 'end_paragraph_id': 1, 'end_character': 116, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '510590', 'title': 'Touched by an Angel', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 821, 'bleu_score': 0.9600096538149311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 926123954002981630}, 'section': 'Section::::Abstract.'}]}]