Question: when is the first game for the nba championship
[{'answer': 'June', 'provenance': [{'wikipedia_id': '22093', 'title': 'National Basketball Association', 'start_paragraph_id': 2, 'start_character': 43, 'end_paragraph_id': 2, 'end_character': 47, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22093', 'title': 'National Basketball Association', 'start_paragraph_id': 75, 'start_character': 0, 'end_paragraph_id': 75, 'end_character': 478, 'bleu_score': 0.8997429226594921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12649425268082900308}, 'section': 'Section::::Playoffs.\n'}]}]