Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       This is the last of the milk .  
 Person2:I know . I intent to go to the store today .  
 Person1:        Would you get some that new cereal we saw advertise on TV .  
 Person2:Which one ?  
 Person1:        You know . The one with the silly art about how advisements have jump up and down .  
 Person2:Oh , you mean kikois .  
 Person1:        Yeah , That ’ s the one .  
 Person2:Well . I ’ ll see , sometimes the store don't have some one of new kinds of cereal . 

formal