{
  "assistantId": "",
  "phoneNumberId": "",
  "customers": [
    {
      "number": "{{ $json.body.customData.number }}",
      "name": "{{ $json.body.customData.name }}",
      "email": "{{ $json.body.customData.email }}"
    }
  ],
  "assistantOverrides": {
    "variableValues": {
      "firstName": "{{ $json.body.customData.firstName }}",
      "lastName": "{{ $json.body.customData.lastName }}",
      "email": "{{ $json.body.customData.email }}",
      "phone": "{{ $json.body.customData.number }}"
    }
  }
}