獎勵機票(亞洲萬里通)..知道ㄉ幫一下

如題.我上國泰網站要用亞洲萬里通ㄉ點數兌換獎勵機票.因為我ㄉ點數只能換有"限制經濟客位".然後我趙他步驟他都一直出現

Not all flights have seats available for the price option you have selected. Please press Back to select another option to price your itinerary or change your flight selection. (4502)

那是不是ㄍ本沒有依各行般可以兌換啊?
有換過的交我一下