Dialog system problems

[I-am-murloc]

I am making a map where you buy units by typing "-buy" (a dialog menu appears and you can pick which unit to buy). You start of by chosing a race from a tavern and depending on which race you chose your camera will be pan:ed to the base of the race you have chosen. Here comes the problem: If you have chosen for example the gnoll race then the dialog menu with gnoll units will appear when you type "-buy" and if you have chosen human then the human menu will appear etc, but I have no idea how to do that.