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:       How are your Chinese lessons going ?  
 Person2:Oh I ’ m learning very slowly . I think Chinese is more difficult than English .  
 Person1:        Well I guess you have fewer characters but I think Chinese grammar is easier .  
 Person2:Maybe , but I think people usually learn English more quickly than Chinese .  
 Person1:        Yes , I guess basic speaking in the English is easier .  
 Person2:Maybe that ’ s why your English is much better than my Chinese . 

formal