[
  {
    "id": "1",
    "participants": [
      {
        "name": {
          "firstName": "Alice",
          "lastName": "Cooper"
        },
        "age": 15,
        "city": "London"
      },
      {
        "name": {
          "firstName": "Bob",
          "lastName": "Dylan"
        },
        "age": 45,
        "city": "Dubai"
      }
    ]
  },
  {
    "id": "2",
    "participants": [
      {
        "name": {
          "firstName": "Charlie",
          "lastName": "Daniels"
        },
        "age": 20,
        "city": "Moscow"
      },
      {
        "name": {
          "firstName": "Charlie",
          "lastName": "Chaplin"
        },
        "age": 40,
        "city": "Milan"
      }
    ]
  }
]