请在登机前至少两小时办理值机手续。

Please make sure to ___check-in at least two hours before your flight.

他发消息跟我确认明天的会议时间。

He ___checked in with me about tomorrow's meeting time via message.

她在咖啡馆签到，分享了自己的位置。

She ___checked in at the café to share her location with friends.