I once asked this question of a spirit guide through a development circle of mediums!
Previously I had asked a spirit in trance mediumship, if we could choose not to reincarnate and return to earth? On that occasion the spirit said no we had to reincarnate and return when we were told. I asked then if we could choose the person we returned as, and again the spirit said no.
In meditation then, I challenged this with my Spirit Guides and said where is the free will? as what we were told in trance was apparently a contradiction to free will. The guides said we do not lose free will in terms of freedom of choice as we are given objectives in the spirit world regarding tasks/reincarnation but we must still make a choice as regards how we meet those objectives. In other words whilst our duties of learning and advancement toward enlightenment were obligatory, we all had free will to choose the methods and pathways laid before us. If the same ends could be achieved whilst not in the physical then so be it, but many lessons could only be learnt through experience whilst in the physical form. The guides went on to say that overcoming animal and base tendencies inherent within the human form, was a part of our learning and advancement!