Set response reprompt output speech as plain text type.

        Args:
            text: str. Response speech used when type is 'PlainText'. Cannot
                exceed 8,000 characters.

def set_reprompt_text(self, text):
        """Set response reprompt output speech as plain text type.

        Args:
            text: str. Response speech used when type is 'PlainText'. Cannot
                exceed 8,000 characters.
        """
        self.response.reprompt.outputSpeech.type = 'PlainText'
        self.response.reprompt.outputSpeech.text = text