2 June is open, it has only just been put on to the marketplace, no one has been allocated a seat yet, it is not sold out. On MMB there is a glitch which means you can only see the blocked First cabin, and being blocked it is stopping you from selecting any seat, but if you call up they can allocate you a seat in the main CW cabin. All seats there are currently available. Alternatively wait a few weeks and they'll move the focus to CW rather than First.