You'll get a free loxley bow if you talk the 'lovestrucking man'. He say that he's in love with a Viera. Then you have to see a Viera (i think at the southgate at Rabanastre). Talk to her and she'll say that she comes to Rabanastre to find her soulmate. Then she'll go to the gambit shop and after that she'll go to sandsea. This is the part that you'll become a cupid between this two person. Continue helping them till they see each other. Then talk to the viera again and you'll get a free loxley bow and a few hi-potions. I think this event are not very important but why not be a cupid for them? Give it a shot. Its really fun though.