You can set or change your availability at any time. Just go to your agency profile, tap “General Availability” and select the times you’re usually available. You will receive job requests during the times you said you were likely available, but if you have other plans come up- don’t sweat it. You can always decline a booking request when it comes through.
Going out of town? No problem. Deselect any of the boxes where you will no longer be available and you won’t receive booking requests during that time. In the event that your agency wants to send a request to you specifically, they have that option. At that point you can just decline the booking.