Does this sound right?

Hi! I was very excited to be offered a new 'FLEX' position in home care. Great hours and wages. Since it is a flex position, they expect for me to submit a monthly availability calender. Then the days I put down for availability, they expect for me to drive into the office and see if they have any work for me to do. Sometimes they have too much staff, and send the flex person happen.

I can't live my life like that! I understand that resource positions quite often have the potential for occasional cancellations due to low census and no guarantee of hours. If there is a need for me to be scheduled, then schedule me! I'm not familiar with home care, so is it more difficult to plan ahead?