1. A voice recognition system, comprising: a microphone configured to receive speech from a user and convert the speech to an audio speech signal; and a voice recognition engine configured to: cause a user expertise evaluator module to detect an indication of an expertise level of the audio speech signal received from the microphone; set an expertise level for the user in a voice recognition setting database based on the indication of the expertise level; retrieve an expertise-to-adjustment association from an expertise database; automatically adjust a voice tree in a voice tree database based on applying the expertise-to-adjustment association to the expertise level for the user; process the adjusted voice tree to generate a prompt in response to the received speech; and output the prompt to the user.