List Column Connection

I have a form that allows people to register for training. I want people to be able to sign up for a specific class. The problem I am having is the form shows a lookup column that has the same title for all of the classes so when they sign up they don’t know which one to choose (see attachment). I would like to somehow connect the columns so when someone chooses one of the titles in the meeting column it automatically updates the Meeting2 column. If that is not possible I can always update the title to add the date.