19. The apparatus of claim 18 , wherein the apparatus is further caused to, upon selection of the matching input mode, perform: analyze the speech application grammar associated with the interaction node; generate a plurality of utterances based on the speech application grammar corresponding to the interaction node, the plurality of utterances associated with respective weighted values; and choose the utterance to be provided as the response to the speech application based on the respective weighted values associated with the plurality of utterances.
18. The apparatus of claim 16 , wherein the utterance generation mode is selected from one of: a no-input mode, the no-input mode signifying a provisioning of a blank input as the response; a matching input mode, the matching input mode signifying a provisioning of an utterance matching a speech application grammar associated with the interaction node as the response; and a non-matching input mode, the non-matching input mode signifying a provisioning of an utterance not matching a speech application grammar associated with the interaction node as the response.