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:       Craig , what do you do for work ? 
 Person2:I'm still a student . 
 Person1:        What school do you go to ? 
 Person2:Boston University . 
 Person1:        That's a good school . What do you study ? 
 Person2:I'm studying English , math , and history . My major is English . 
 Person1:        How long have you been studying English ? 
 Person2:More than six years . 
 Person1:        That's a long time . 
 Person2:Yeah , I started to learn English when I was in high school . 
 Person1:        No wonder your English is so good . 
 Person2:Actually , it's not that good . I can read but I can't speak very well . I haven't had a lot of chance to practice . 
 Person1:        I see . Talking with other people is very important . 
 Person2:Yes , but I still don't have many friends here yet . 
 Person1:        I'm having a party tonight at my apartment . You should come . 
 Person2:Oh thanks for inviting me . I'd love to come . 

informal