decide the tone/manipulate the words in which the bot talks

guys im facing a problem: i want the chatbot to use informel language instead of formal ... in germany theres this thing where you say "Sie" to talk in a respectful, formal way. But i want to use "Du", to make the conversation more approachable ... but the website where im getting the info from is only talking in a respectful formal manner so the chatbot uses the same language ... i dont know what to do, any ideas? i thought of replacing the words using javascript before the chatbot response