Ok, I would imagine Bengal females act much the same as any other female cat when in season. They become vocal and they roll about on the floor a lot, and generally put their bums up in the air at every opportunity!
Having said that, if the reason this cat owner is asking about seasons is because they are considering breeding their cat, it might be wise to point out all the cats (pedigree as well as moggy!) that already need homes.
There are two bengals on the rehoming section as I type.