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:       Hi . You enjoying the party ?  
 Person2:Yes , actually . I don't really know anyone , but it's a nice place . Are you having a good time ?  
 Person1:        Yes . The drinks are very good ! I'm Paul , by the way .  
 Person2:Hello Paul . I'm Jane . So what do you do ?  
 Person1:        I'm in finance . You ?  
 Person2:Really ? Me , too . I work for an accountancy company , T & D . Maybe you've heard of them .  
 Person1:        T & D ? Oh , yes , sure . How long have you worked there ?  
 Person2:About two years . And you ? Are you based here ?  
 Person1:        No . Actually , I'm based in Shanghai . I'm just here for the conference . So , T & D eh ... 

informal