At this time, the Walt Disney World and Disneyland Resort call centers will not be taking any new bookings for the months of April and May. New bookings for Walt Disney World Resort, Disneyland Resort and Aulani Resort will be available for stays starting June 1, 2020.
As a reminder, Walt Disney World and Disneyland theme parks, Disney Resort hotels, the Disney Springs area, Downtown Disney and Aulani Resort are currently closed and a reopening date has not been identified. For guests who are interested in modifying their existing travel dates or making a new reservation for a future vacation, reservations are currently available for travel dates June 1 and later. As always, Guests are able to modify these bookings if Walt Disney World,Disneyland or Aulani Resort opens before or after that time.
source: Disney Travel Agents