You can provide your regular availabilities in your employee profile. For example, if you are generally available to work on Monday from 8 am to 6 pm, you create a new availability for those dates. 

Now, when the admin or manager plans a certain shift, he will be shown a list of all employees that stated that they are available in the given timeframe. The admin or manager then can easily assign you to a shift that you are available for. 

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