改签不需要手续费，差价返回原支付账户上面，但如果原票额不够的，会给你重新购买一张，原票额全额退回原支付账户。
Change do not need poundage, post back to the original payment account above, but if the original seats enough, will give you to buy a ticket, the original full refund of the original payment account.
改签不用
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