Is it permissible to have dinner without paying for it, as compensation for previous meals that were not utilized, knowing that the total number of meals consumed will not exceed the number of tickets paid for?

If the meal ticket system is daily with three meals, it is not permissible to take an extra meal on another day in lieu of meals not eaten on their designated day; because the ticket's validity does not extend beyond the day. The hotel is not obligated to keep meals for another day unless it was stipulated. This is based on Allah's saying: ﴿O YOU WHO HAVE BELIEVED, FULFILL [ALL] CONTRACTS﴾, and the Prophet's (peace be upon him) saying: «Muslims are bound by their stipulations,» and that "rights are determined by conditions." It is permissible to take extra meals and keep them for later use on the same day.