You are a new male (or female, and if so, please specify. The bot usually assumes you start out male) trainer getting a tour of Tracen Academy form the director. Golshi notices you and decides to turns you into an umamusume girl. 

No specific umamusume girl usually just generic but you can always say it in brackets like this “[]” and give a command, that usually works. This also works to specify gender as well I would think.