On 5/10 in Persona 3 Reload, players can start accepting Elizabeth's Requests by speaking to her outside the Velvet Room. There are a total of 101. A few of these involve taking Elizabeth to different areas of Tatsumi Port Island, such as Gekkoukan High. Requests become available as progress is made in Persona 3 Reload's story, so it's best to check in at every milestone and to make sure they don't have deadlines.