By immersing trainees in a virtual space and conducting customer service training with customer avatars, physical training facilities are no longer required and customer service training costs can be reduced. Furthermore, since there is no need for travel time to the training facility, trainees can easily participate in training even from remote locations. However, the production cost of customer avatars that behave according to training scenarios has become a new issue in social implementation. Therefore, we conducted a preliminary implementation experiment of a customer avatar that works autonomously by incorporating LLM and reported the findings and problems we encountered.