Caribbean cruise with escort

I won a 7 day cruise on Carnival Cruise Line from Galveston. I was thinking of taking some company but have no idea what an escort would expect to go on a vacation. Has anyone ever faced this problem. I must take the cruise this summer. I have a free trip but I can't afford a $1000 a day escort. When I bought the chance on this cruise I had some one that would have gone with me that I thought would not charge me an arm and a leg.