I made a reservation to park in the Ecopark 2 lot at IAH for the next 2 days, but just found out that my exit time may end up being later than what I recorded during my reservation (due to a likely delayed flight). Will I need to extend my reservation or will it just be accounted for when I exit? And if its the latter, what is the additional rate that I'll have to pay in addition to my reservation? I'll still be arriving on the same day, just a few hours later than anticipated.