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 blouse is a special offer today . You can have it at 10 % off the regular price .  
 Person2:It's nice , but still too expensive . Can you give me a 20 % discount ?  
 Person1:        No . 10 % is my last word .  
 Person2:Come on . Let's split the difference , 15 % . 

informal