Approval & Information process with Microsoft Power Platform & Outlook

Request manager approval for leave requests on base holiday and inform about sick leave. App needs to provide several approval request to several person and tracking of booked holiday in calendar. Should also provide a function to see if several person already have booked holiday or if it is free. Overview of how many days are left of the holiday budget should be included.
Solution should be based on Microsoft Power Platform, Sharepoint & Outlook.