@Guido_Gaveglio My experience is the Trapzie app does not work well in English either.
Does the unmodified app work correctly for you?
Be aware Mayank indicates:
Questions have to be exactly the same as the dictionary to get more than a vague response . You need to type the exact upper and lower case and punctuation that the dictionary knows for it to work). It could be made more friendly if all queries are made in lower case and the developer used the upcase downcase text Blocks in the dictionary text. You have to provide and adapt the code to make the example more user friendly. The app is an example of what can be done.
The example is a framework that has some great ideas . The example needs to be used with caution.
Speech Recognition can be implemented but you have to use the SpeechRecognizer to populate Trapezie's TextBox input to ask the questions. This is not Alexa.
one way to do that would be to use techniques like used in
You can make this work like you want it to work 
but adapting it will not be easy.
Try the suggestions here Problem facing in making chatbot - #12 by ABG