Say you got hired for a job, but did not have orientation yet...

Your 19 and you want to change your schedual from 3:30pm to 11:30pm to 3:30 to 9pm, 9:30pm, 10pm, or 10:30 pm due to not having a ride back home would this be a big deal? Will they find someone else if you ask the manager? The problem is not getting there its getting back.