Question: who plays luna in the harry potter movies
[{'answer': 'Evanna Patricia Lynch', 'provenance': [{'wikipedia_id': '3931304', 'title': 'Evanna Lynch', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]