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:       Do you mind if I ask you a question ?  
 Person2:No , not at all . Go ahead .  
 Person1:        What do you do in order to improve your English ?  
 Person2:I go to movies ; I go to lectures ; I listen to the radio ; I do lots of things . Most importantly , I practice every chance I get .  
 Person1:        It ’ s a good idea to have a radio , isn ’ t it ?  
 Person2:Sure . It ’ s like understanding on the telephone — — you can ’ t see the speaker ! It ’ s great for improving listening comprehension .  
 Person1:        It takes a long time to learn a language , doesn ’ t it ?  
 Person2:It certainly does . But if you practice speaking every spare minute and learn useful sentences every day you can make big progress . 

formal