question: What is the first name and last name of the customer that has email "luisg@embraer.com.br"?
#1 return customers 
#2 return #1 that  has  email luisg @ embraer.com.br 
#3 return first name  of  #2 
#4 return last name  of  #2 
#5 return #3 ,  #4