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:       Hey , that ’ s a very nice hairdo you ’ re wearing !  
 Person2:Oh you ’ re exaggerating . I ’ m never really good at making hairdo .  
 Person1:        You did it yourself ? Wow , you are good !  
 Person2:Thanks for saying so , but my husband thinks otherwise .  
 Person1:        He ’ s just got no idea of how good you are . 

informal