in src/main/java/com/amazonaws/lex/twilio/sample/streaming/BotResponseHandler.java [117:126]
private void handle(IntentResultEvent event) {
LOG.info("Got an IntentResultEvent: " + event);
isDialogStateClosed = DialogActionType.CLOSE.equals(event.sessionState().dialogAction().type());
// if dialog state is closed, stop sending events to lex server
// after the last message is played back, ask twilio call operator to hang up
if (isDialogStateClosed) {
botConversation.stopConversation();
}
}