State the customer name of orders which has shipped date in 7/8/2018.
shipped date in 7/8/2018 refers to ShipDate = '7/8/18'
SELECT T FROM ( SELECT DISTINCT CASE  WHEN T2.ShipDate = '7/8/18' THEN T1.`Customer Names` END AS T FROM Customers T1 INNER JOIN `Sales Orders` T2 ON T2._CustomerID = T1.CustomerID ) WHERE T IS NOT NULL