How to make context request in dialogoflow via nodejs sdk?

Question

I would like to know how to create a context dialog, but I don't think anything about how to make this request... can anyone help me?

i'm using a lib sdk dialogflow

I searched how to do this, but I don't find anything, I don't know how to implement this..

me code

class DialogFlowController {
  public dialogID: string
  public sessionID: string
  public sessionClient: SessionsClient

  constructor () {
    this.dialogID = 'chatbot-asxj'

    this.sessionID = v4()
    this.sessionClient = new dialogflow.SessionsClient({
      credentials: {
        type: config.gooogleType,
        client_id: config.googleClientId,
        private_key: config.googlePrivateKey,
        client_email: config.googleCLientEmail,
        token_url: config.googleTokenUrl
      }
    })
  }

  public async interactor (req: Request, res: Response): Promise<Response> {
    console.log(teste)
    const messagem = req.body.goMessage

    try {
    // Create a new session
      const sessionPath = this.sessionClient.projectAgentSessionPath(this.dialogID, this.sessionID)
      const request = {
        session: sessionPath,
        queryInput: {
          text: {
          // The query to send to the dialogflow agent
            text: messagem,
            // The language used by the client (en-US)
            languageCode: 'en-US'
          }
        }
      }
      const response = await this.sessionClient.detectIntent(request)

      Socket.io.emit('returnMessage', response[0].queryResult?.fulfillmentText)
      return res.status(200).json()
    } catch (err) {
      return res.status(500).json(err)
    }
  }
}