Say the provided speech to the user.

        :param speech: the output speech sent back to the user.
        :type speech: str
        :param play_behavior: attribute to control alexa's speech
            interruption
        :type play_behavior: ask_sdk_model.ui.play_behavior.PlayBehavior
        :return: response factory with partial response being built and
            access from self.response.
        :rtype: ResponseFactory

def speak(self, speech, play_behavior=None):
        # type: (str, PlayBehavior) -> 'ResponseFactory'
        """Say the provided speech to the user.

        :param speech: the output speech sent back to the user.
        :type speech: str
        :param play_behavior: attribute to control alexa's speech
            interruption
        :type play_behavior: ask_sdk_model.ui.play_behavior.PlayBehavior
        :return: response factory with partial response being built and
            access from self.response.
        :rtype: ResponseFactory
        """
        ssml = "<speak>{}</speak>".format(self.__trim_outputspeech(
            speech_output=speech))
        self.response.output_speech = SsmlOutputSpeech(
            ssml=ssml, play_behavior=play_behavior)
        return self