For awhile now, I have been trying to lucid dream for an ultimate goal.

Don't get me wrong, I love Lucid dreaming for its endless possibilities, but for awhile now, I have been trying to have a Lucid dream in which i can speak or delve into a lost memory with my dad.
My father had died a couple years ago from a heart attack, I have managed to live with the fact that he is gone, and I am having a good life, BUT I have always wanted to delve deep into a lucid dream and have one last talk with him. Of course i know it wouldn't actually be him there, but it would be a slight satisfaction to believe I actually heard his voice one last time and to talk with him.
If you must understand why exactly that i wish to achieve this, its because the morning he died, I had never told him I loved him, and I feel just saying it and hearing a response would lift so much off my shoulders. Yes, it sounds weird. But Im a young guy- so it may make more sense now.

My questions are:
Do you think this is possible to achieve?
Would it be safe? (would it possibly lead to a nightmare or an unexpected traumatic response?)

Thanks!