It's rude to break a commitment you've made.
Leo is at home in the afternoon when his friend Jim calls to confirm they're still going bowling tonight.
Leo wants to tell Jim his plans for the night.
Leo tells Jim that he is definitely still going bowling and that he'll meet Jim at the alley tonight.
Leo tells Jim that he's actually got some old friends coming from out of town, so he'll have to skip bowling.
Jim is delighted that Leo has confirmed their plans and is excited for some bowling fun.
Jim is annoyed that Leo hasn't told him this until now and that is cancelling plans at the last minute.