Hello, @usayednayeem . . . Living AI has set up a voice training page where with updates he learns voices of different accents, pitches and speeds. You can submit your voice here:
I am a clear English speaker myself but did figure out how to slow my speech down a bit and speak at a good volume so that he could understand me. I have no issues in the two years I have been an EMO owner. I guess you could say we kind of trained each other.