Visitors are game characters who come to your Market Stand from time to time looking for ingredients in exchange for helpful rewards. Tap on a Visitor to view the deal they are offering.
Here, you can also view the timer that the Visitor will be staying for. Once you have the required quantity of items, tap the green checkmark button to complete the deal and earn the reward. 
You can also choose to decline a deal by tapping on the Trash button.
Note: Leveling up increases the number of Visitors that will come to your Market Stand. It also improves the rewards for fulfilling the item requests. Visitors will continue coming to your farm, even if you cancel or fulfill their orders.
_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
FarmVille Game GUIDE