Who do i sit with?

im going on a six flags trip and 2 of my friends want to sit with me, and i only want to sit with bre. not the other girl. its just she is boring and she talks about stuff i dont like, and i want to be her friend i just want to sit with bre. how do i tell her that i dont want to sit with her. i no its drama and its dumb. but i also dont want to get sick because the other girl has a swore throat and i dont want that.. so what do i do? i really need help! fast!!