。
If I change my reservation, will the price change?
Literal
Reservation [object-を] change-[conditional-と] price [subject-が] change-[polite-ます]-question?
A clean example of the ~と conditional — 'whenever/if X, then Y' — used for near-automatic consequences. Distinct from ~ば (general-condition), ~たら (once X happens), and ~なら (given X). ~と works well here because the question is about whether the price-change is an automatic result of the reservation-change.