I seem to remember having the same thing happen to me - have you tried resting or leaving the area before re-approaching him? This can work sometimes.
Its not too much of a major deal though as you should be able to just go and talk to Silke anyway, missing out Garrick (I think - its a while since I played in Beregost).
SPOILER ALERT
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she's hanging out by one of the inns (x3455 y2130) - just talk to her directly and you should be able to complete this little sub-quest. Then try talking to Garrick afterwards and you might be able to engage him in reasonable conversation again.
Hope this helps - as I said its been a while (currently on IWD).
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The Duke<br />_ _ _ __ _ _ _ <br /><br />\"Me? With my reputation? Whatever were they thinking of?\"<br /><br />
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