Before revision:  We give upper and lower bounds for the whole range of reservation costs, with tight bounds for costs up to 1/ 6---an area that is strictly 2-competitive---and for costs between 2-1 and 0.5---an area that is  (2+\alpha)-competitive .
After revision:  We give upper and lower bounds for the whole range of reservation costs, with tight bounds for costs up to 1/ 6---an area that is strictly 2-competitive---and for costs between 2-1 and 0.5---an area that is strictly (2+\alpha)-competitive .