请列出五个城市，按字母顺序排列。添加每个城市的所属国家
user
{"cities": [{"name": "北京", "country": "中国"}, {"name": "巴黎", "country": "法国"}, {"name": "柏林", "country": "德国"}, {"name": "大阪", "country": "日本"}, {"name": "伦敦", "country": "英国"}]}
assistant