Question: when did harmony of the seas set sail
[{'answer': '15 May 2016', 'provenance': [{'wikipedia_id': '45485466', 'title': 'Harmony of the Seas', 'start_paragraph_id': 3, 'start_character': 349, 'end_paragraph_id': 3, 'end_character': 360, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '45485466', 'title': 'Harmony of the Seas', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 571, 'bleu_score': 0.9471809134444701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18203249569658983818}, 'section': 'Section::::History.\n'}]}]