curl --request PUT \
  --url https://api.nuvia.ai/v1/conversations/{id}/assign-agent \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "agentId": "<string>"
}
'

{
  "last_activity_at": "<unknown>",
  "contact": "<unknown>",
  "inbox": "<unknown>",
  "company": "<unknown>",
  "_id": "<string>",
  "additional_attributes": "<unknown>",
  "agent_last_activity_at": "<unknown>",
  "contact_last_activity_at": "<unknown>",
  "allow_send_messages_at": "<unknown>",
  "agent": "<unknown>",
  "current_step": "<unknown>",
  "user": "<unknown>",
  "requires_attention": {
    "requested_at": "<unknown>"
  },
  "referral": "<unknown>",
  "createdAt": "<unknown>",
  "updatedAt": "<unknown>",
  "resolved_count": 123
}