Amtrak의 "Value Fare"는 100% refundable인가요?

8월 Amtrak 여행을 계획중인데, 환불 가능하면 표를 미리 사두려고 합니다. non-refundable한 Saver Fare는 안 보이고, 가장 낮은게 value fare인데요,

Value Fares

Refundable: Full refund if canceled 24 hours or more before departure. 10% fee charged if less than 24 hours. Unreserved tickets incur 10% fee at all times.

eVoucher available: Full value, no fees.

Value Fares offer several refund options. Value Fare tickets are fully refundable if canceled more than 24 hours prior to the scheduled departure from the origin but will incur a 10% refund fee if canceled less than 24 hours prior to scheduled departure. Value Fare tickets can be canceled with the ticket value stored as a credit in an eVoucher that can be used for future Amtrak travel. If not canceled before the scheduled departure from the origin ("no show"), the entire amount is forfeited and cannot be applied toward future travel.

The Value Fare is available on all trains and buses. The number of seats available on each train at the Value Fare is limited.

제가 제대로 이해했다면,

- 구입한 credit card로 돌려받거나, Amtrak 바우처로 받는 옵션 중 선택할 수 있음

- 24시간 전에만 취소하면 100% credit card로 리펀드, 이후엔 10% fee

- Amtrak 바우처로 받으면 100% 리펀드 (24시간 제한없이?)

- No show는 얄짤없음

근데 "Unreserved tickets incur 10% fee at all times"는 어떤 경우를 이야기하는 것인가요?