conversation2.js

class Conversation {
   
    //...
    
    _greetNewUser() {
        if (this._isScreenAvailable()) {
            this._askWithSuggestionChips(Str.GREETING_NEW_USER, Str.GREETING_USER_SUGGESTION_CHIPS)
        } else {
            this.dialogflowApp.ask(Str.GREETING_NEW_USER, Str.GREETING_NEW_USER_NO_INPUT_PROMPT);
        }
    }

    _isScreenAvailable() {
        return this.dialogflowApp.hasSurfaceCapability(this.dialogflowApp.SurfaceCapabilities.SCREEN_OUTPUT);
    }

    _askWithSuggestionChips(speech, suggestions) {
        this.dialogflowApp.ask(this.dialogflowApp
            .buildRichResponse()
            .addSimpleResponse(speech)
            .addSuggestions(suggestions)
        );
    }
}