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:       Is there something wrong ? You look so sad .  
 Person2:My house was robbed last night and the thieves stole all my furniture .  
 Person1:        No wonder you look so upset . Have you called the police ?  
 Person2:Yes , I have . But I have to wait . 

informal