Hi @Reisz_Soma, @Stace and @Mark_Nattress 
Resource management is on its way and will be available with our Business plan (Asana Pricing | Free, Premium, Business, & Enterprise plans • Asana). If you’re interested in discussing this further, have a look at this thread in which my colleague Christa from the User Experience Team is asking for your feedback!
In the meantime, I would suggest adding a OOO section in your project with a task for each day. You could clearly indicate in the title of each tasks what time you’re available at for example.
Hope this helps!