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:       Wow ! That's a fantastic movie ! 
 Person2:Yes . I love it , too . 
 Person1:        Who was the director ? 
 Person2:I'm not sure , but I think it must be directed by Zhang You . That's typical of him . 

informal