Audio chunk acknowledge (ack)

{
  "session_id": "4a39145c-2844-4557-8f34-34883f7be7d9",
  "created_at": "2021-09-01T12:00:00.123Z",
  "acknowledged": true,
  "error": null,
  "type": "audio_chunk",
  "data": {
    "byte_range": [
      1024,
      2048
    ],
    "time_range": [
      0.8,
      0.9
    ]
  }
}