Sailing on Carnival Liberty in January, do they

have tables to accomodate 12 people (6 couples)

for dinner. Can I request in advance? Thanks

Most tables on Carnival will hold up to 10 people, just make sure that you cross reference all the booking numbers, this way you can at least be at tables side by side. If you used a travel agent, get back with them and let them know that you expect to dine together.