开房:check in
退房:check out
存房:keep
开房
A:Hi,there,may I help you with check in?
B:Yeah,thank you
A:My plesure
退房
A:Hello,you wanna check out?
B:Yes,.
存房
A:How are you today?
B:Fine,thank you,I wanna keep my room for more day/s.
A:Ok,.
大致就是这样啦,这些是比较口语化的,语法没有按照规则,不过老外都这样说的啦,希望可以帮到你.