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I don't know of any such book... I've got a small library of all sorts of screenwriting books and none of them have showed me anything that I didn't already have up stairs... well, format and placing aside.
Dialouge is a girft you have... or... don't have. You have to work on it more than any other area in your screenwriting craft.
However, you are not without options... if you just do some basic research of certin topics, you'll see a big jump in dialouge quality.
Read a book called College Slang 101 and pop culture 101 -- two great books on my shelve I like to flip thru when I get sussed out with my trivial ramblings on... it opens up so many doors.
Again, dialouge is something you have to work for... I see so so many crap ass screenplays around here that look and read like they were thrown together in a weekend "story, concept and all"... If you are 100% serious about writing and you care for what you write... you won't be able to finish a full 120 - 130 page screenplay in a week.
It's gonna take work, research, picture taking, plot lay outs, atleast 2 notebooks of material to work from, 2 to 3 re-writes and an open mind...
If you have the will to do the above, you don't need a book to tell you how to write better... I just told you how.
it is a gift, but i think its something that can be improved as well... as in, if you're crappy, theres still hope if you work hard... but it is the hardest part of writing a script, i think. it always ends up being the part of my script i hate the most and want to delete...