AKs. I reraise then fold

[PokeHer]

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) http://216.119.70.224/converter/hhconverter.pl

UTG ($27.15)
MP ($44.83)
CO ($146.39)
Hero ($24.90)
SB ($55.50)
BB ($22.25)

Preflop: Hero is Button with A[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $0.10.
<font color="#CC3333">UTG raises to $2</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $7</font>, <font color="#666666">2 folds</font>, UTG calls $25.15 (All-In), Hero folds.

Final Pot: $34.50


This was one of my first few hands at the table. What do you do here against a standard party unknown? With my notes now, i see he is 18.6% PFR, so I would have called given that info.