1. A computer implemented method for creating a call routing system, the computer implemented method comprising: receiving a set of initial target classes and a corresponding set of topic descriptions; identifying non-overlapping semantic tokens from the set of topic descriptions; identifying a set of clear target classes from the non-overlapping semantic tokens and the set of initial target classes; identifying overlapping semantic tokens from the set of topic descriptions; identifying a set of vague classes from the overlapping semantic tokens and the initial target classes; generating a set of disambiguation dialogues and a set of grammar prompts according to the non-overlapping semantic tokens; and creating the call routing system based on the set of clear target classes, the set of vague target classes, and the set of disambiguation dialogues.