async start(message) {
    // register the message in the chat history
    this.newMessage(message);
    this.emitter.emit("start", message, this);

    // ask the node to reply
    await this.chat({
      to: message.from,
      from: message.to,
    });

    return this;
  }
Start a new chat.

@param message The message to start the chat.