Question: who played sam phillips in walk the line
[{'answer': 'Dallas Roberts', 'provenance': [{'wikipedia_id': '1641890', 'title': 'Walk the Line', 'start_paragraph_id': 16, 'start_character': 12, 'end_paragraph_id': 16, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]