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:       Can you speak Japanese ? 
 Person2:Yes , I can , but not very well . 
 Person1:        Where did you learn it ? 
 Person2:At school . And I'm still learning it now . 
 Person1:        How long have you been learning it ? 
 Person2:About three years . 
 Person1:        Can you speak any other languages ? 
 Person2:I'm afraid not . 

formal