My task book is empty at the moment so i put all my characters on 24 hr jobs, if a random speech bubble pops up i just leave the character until i have finished assigning the jobs hit the millhouse/bart button then go back to my town and the speech bubble will be gone to put him/her on a 24hr task.
Theres nothing worse than all your characters on 24 hr jobs at the same time and 1 gets hit with a shop at the KEM task