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:       Mike has changed much after marriage .  
 Person2:Yeah . He ’ s almost become a slave , his wife is leading him by the nose .  
 Person1:        It ’ s unbelievable . He used to be such a rough guy . 

informal