I was able to make a reservation for a Saturday in December by phone just the other day (no availability in
MDE). They were strict on a party of more than six (we're eight) would need to plan for two separate tables and also needed two different Landry card #s to make the reservation (note that we're a group with adults and teens ... not sure if different with young kids). Luckily two of us going have Landry cards. You need the Landry card # and the phone # associated with it to make the reservation (I was able to give my friend's # when I called, they didn't have to call separately). I called in between prime lunch and dinner hours (~3pm ET) and got through quickly and made the reservations easily. You get a text confirmation, but it does not show up in MDE.