code: func (c *Conversation) Reply(text string, a ...interface{}) {
  	prefix := ""
  
  	if !c.message.IsDirectMessage() {
  		prefix = "<@" + c.message.User() + ">: "
  	}
  
  	msg := c.message
  	msg.SetText(prefix + fmt.Sprintf(text, a...))
  
  	c.send(msg)
  }
docs: // Reply sends message using the socket to Slack