如果已购买的机票被确认不再使用并需要退票，则需要在差旅费报销申请表中提供相应证明文件。
In case a bought ticket will not be used and will be refunded, this has to be documented in the travel expenses claim.
员工可自费升舱，但应在相应的出差申请表和差旅费报销申请表中注明。
Employee can upgrade to higher class(es) at their own expenses with a respective remark both on the Travel Application Request and on the Travel Expenses Claim.
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