Most of the Requests you start receiving from Elizabeth in Persona 3 Reload are easy to complete. In some scenarios, you may have already complete the request at the time of accepting it. Others, such as "Request 56: Bring me a drink with my name," will require you to accept the quest before you can find whatever Elizabeth needs in Persona 3 Reload. Going by the title of Request 56, the obvious place to look would be the Club Escapade in Paulownia Mall. Ironically, this is not the case, and you'll have better luck finding the key item if you search Port Island Station.