Hello Rakhi,
Thank you for stopping by planDisney with your question!
Elsa and Anna are certainly a dynamic duo, and meeting them in person tops a lot of guests' "must see" lists. Recently, guests have been able to see the royal pair together at
Royal Sommerhus in EPCOT's Norway Pavilion.
There are no reservations required for meeting your favorite Frozen stars. Guests simply form a line and wait their turn. I don't think there is a set schedule for their appearances, so you'll have to check throughout the day -- maybe when you ride Frozen Ever After or stop by Kringala Bakeri og Cafe to try some School Bread.
When you do meet Elsa, Anna (or hopefully both at the same time), you will be socially distanced from them. No hugs right now, and they aren't signing autographs, but they still do a fantastic job interacting with guests and will absolutely pose for some fun, socially distanced photos.
If your vacation includes plans at Hollywood Studios, be sure to check out
For the First Time in Forever: A Frozen Sing Along Celebration. It's so much fun for all ages!
Hope this helps. Have a magical vacation!
Diane