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:       There ’ s a big sale on clothes and sporting goods at Riverside Mall .  
 Person2:Sporting goods ? Is that bike Tim wanted on sale ?  
 Person1:        Yeah , it ’ s 30 percent off the regular price .  
 Person2:Well , maybe we could get it now and hide it until his birthday .  
 Person1:        Yeah , it ’ s a couple weeks away , and we don ’ t have anything yet .  
 Person2:Don ’ t buy him underwear again . He hates that .  
 Person1:        I know , I know , but if I didn ’ t buy it for him , he ’ d never buy it .  
 Person2:See anything else we need there ?  
 Person1:        Well , all shoes are 20 percent off .  
 Person2:Shoes ? You already have a closet full of shoes .  
 Person1:        I know , but another pair can ’ t hurt .  
 Person2:Oh , all right . I need some new shirts , too . Let ’ s go after breakfast . 

formal