Answer:
I am always coming but I never arrive. What am I?
I can wave my hands at you but I never say goodbye. You are always cool when with me even more so when I am high!
Why are there no living cats on Mars?
I am a portal to another world which you cannot enter. Only you can see me but I can't see you.
First I may be your servant's name. Then your desires I may proclaim. When your mortal life is over, I hold all your wealth within my power. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.