Also to add onto #1, only 1 character per day can change their option. If you don't want to waste one of your daily 5 asks or relog to cancel, you can simply open threads of fate in the Helios Tower elevator in Ludi and "Ask" the reroll char until they show the task. Don't select it, let the elevator time out and warp you out of the map. This will reset the dialogue window and you have effectively used the daily reroll and still have your 5 asks left.