What to do i can't say no to them now ..?

hi i a getting my belly dun next weekend and it is booked for 1 oclock oki and my fried told me today tht my oppointment is 2 oclock for my present please help wt should i do .. it wont be possible for me to get there in that amount of tme...should i tell her tht my oppontment is booked for 1 o clock at the place i am getting my belly done