What is the best way to remove a contact from a campaign when they book an appointment through my booking page

I have created a campaign where I offer a free training in exchange for their email and then I offer them a free strategy session and allow them to book through my Keap booking page. If they don’t book the strategy session I want to follow up with them through an email sequence, but if they do book an appointment I want them removed from this campaign. So what is the best way to make that happen?