People shouldn't give their word unless they mean it.
Paul is flying home for Christmas tonight when his friend Josh asks him for a ride to the airport the next morning.
Paul wants to respond to Josh's request for a ride to the airport.
Paul tells Josh that he would help if he could, but he's leaving town tonight.
Paul tells Josh not to worry and promises he'll give him a ride the next morning.
Josh finds another friend to give him a ride and makes his flight.
Josh misses his flight when Paul doesn't show up to take him to the airport, and he has to buy another plane ticket.