Question: when did symphony of the seas set sail
[{'answer': '7 April 2018', 'provenance': [{'wikipedia_id': '53427583', 'title': 'Symphony of the Seas', 'start_paragraph_id': 18, 'start_character': 51, 'end_paragraph_id': 18, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Route.\n'}]}, {'provenance': [{'wikipedia_id': '53427583', 'title': 'Symphony of the Seas', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 49, 'bleu_score': 0.6803749333171201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13314952070852238897}, 'section': 'Section::::Construction timeline.\n'}]}]