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:       Tom , you look thoughtful and unhappy recently . What's wrong with you ?  
 Person2:Lily broke up with me last week . In fact , she dumped me .  
 Person1:        Why ? I mean , why did she part company with you after seven years together ?  
 Person2:She said it was because we had very different ideas about life .  
 Person1:        Do you believe her excuse ?  
 Person2:Of course not . I knew she had fallen in love with another guy . It is difficult to see her move on so quickly .  
 Person1:        Come on , buddy , cheer up . Why not do some sports with me ? Violent exercise might help to shake you out of your disappointment in love .  
 Person2:Thank you , Steven . You are really a good friend . 

informal