I, myself: amin
our: lye
you: lle
us: lye
in: e'
with: yassen
love: mela
yes: uma
no: n'uma
gold elf: mal'quessir
friend: melon
farewell: namaarie

Now here are some phrases in Sindarin.

Nice things to say to people!
Pleasure meeting you: Saesa omentien lle
Until later: Tenna' telwan
You did well: Lle ume quel
I love you: Amin mela lle

Now for some Insults!
Cowardly dogs: Nadorhuanrim
Go kiss an orc: Auta miqula orqu
I hate you: Amin delotha lle
You disgust me: Amin feuya ten' lle
Your head is empty: Dolle naa lost

For more Elvish words and phrases click here