Question: when did messi make his debut for barcelona
[{'answer': 'October 2004', 'provenance': [{'wikipedia_id': '2150841', 'title': 'Lionel Messi', 'start_paragraph_id': 2, 'start_character': 304, 'end_paragraph_id': 2, 'end_character': 316, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2150841', 'title': 'Lionel Messi', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 835, 'bleu_score': 0.909989773333819, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4869613914186526613}, 'section': 'Section::::Abstract.'}]}]