I booked both of my rooms separately online but Im pretty sure can just do it over the phone at the same time. I called them yesterday from the U.S and was on hold for about 5 minutes only for an agent but beware of some agents who work the English line- I had an agent that was so bad at it I almost cried. After like 15 minutes she just gave up and told me to call back later then I finally got one who was much better.