If I understand the question correctly the problem is that you want the chatbot to estimates when a number is big or small and gives a specific response. For me, the best option is to find the number in the string, modify it to integer and then compare it with the given variable. Chatterbot can manage mathematical evaluation if you use the MathematicalEvaluation logic adapter instead of BestMatch. I don't think there is an embedded way in the library to give a combined text with strings and numbers and let the chatbot do the trick