Question: when did the tv show dallas first air
[{'answer': 'April 2 , 1978', 'provenance': [{'wikipedia_id': '99434', 'title': 'Dallas (1978 TV series)', 'start_paragraph_id': 7, 'start_character': 20, 'end_paragraph_id': 7, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Original premise.\n'}]}, {'provenance': [{'wikipedia_id': '99434', 'title': 'Dallas (1978 TV series)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 672, 'bleu_score': 0.9695490931243761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14460894714111277085}, 'section': 'Section::::Abstract.'}]}]