What to say if she says no to going out?

i am going to ask this girl out tomorrow shes coming over to help study then i was gunna drop her off and ask here if she wanted to go out this Saturday and i was wandering what to say if she says no, like to take away some of the awkwardness and i even heard u can act like it doesn't faze you then she might accept later cause she thinks you can do without here, so what would u say if she said no