Say to him/her. The place where I'm sitting has quite a bit foot traffic and comes with people's conversation which is distractive to me. I found out a nearby spot. If it is available, can I take that one?
Note:
1. Don't let others choose a spot for you because it may not work out for you either.
2. Be courteous, make sure you check availability first.
Hope it will work for you or you are inspired for even better idea/soultion.
