可以考虑以下的说法：
“Regarding the settlement/payment of the ticket,is it correct to say that the Hangzhou company will make payment first,and then the company in US will reimburse it (the Hangzhou company) later?Please revert to me so that I could get the ticket ready.Thank you."
这里中文跟英文的说法是有区别的,不能直译.因为它的意思是关于是否由杭州公司先垫付费用,所以给你把意思弄清楚,意译就行了.