本人在线等..在国外机场遇到物品要托运的时候用英文怎么讲,

consignment service 托运

换登机卡怎么换
How can I change a boarding card.

boarding card 也可以表达为 boarding pass.

where can i check in for *** airline?问到哪里换boarding pass

托运行李是在换登记盘的地方啊一起就办了
如果是中国的航空公司你可以说中文的

实在没办法你就说where should i go给人家看你的tickets

I want to have this luggage checked/where do I check my luggage?

I need to get the boarding card/where do I get my boarding card?