Hello Raxesh,
Welcome to planDisney! Your trip is just days away and I'm so excited for you! I looked up the
Theme Park Reservation Availability and I do see that on March 31, 2023, Magic Kingdom Park has no more availability.
I'm so sorry to be the bearer of bad news but if there are no reservations available then you will not be able to secure a reservation for the two other people you want to add. I would like to offer a solution. Those two other people can purchase Park Tickets with a
Park Hopper Option. Once you have this option added to the ticket you can visit more than one Park at a time. So I recommend that your two other guests book a Park Reservation at one of the available Parks and then "hop" on over to Matic Kingdom to join you at 2:00 PM. It seems that EPCOT, Disney's Hollywood Studios, and Disney's Animal Kingdom Theme Park are all still available at the time I'm writing this.
Another solution is to consider
changing the Park Reservations for everyone to a Park with availability so that you all can be together. Now, I understand if you have dining reservations for Magic Kingdom Park this would be a difficult thing to do as those
dining reservations are also hard to get sometimes.
Finally, there is a small chance that some reservations can open up as your Park day approaches. Just like you, people will be considering changes and may modify their reservations and two spots may open up. This would require you to be diligent and keep checking for any availability.
I'm sorry I don't have better news but I will be sending a ton of pixie dust your way so that your dreams can happen!
Happy Planning!
-Nimmy