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:       Were you born in the U . S . , Melissa ?  
 Person2:No , I wasn't . I came here in 1992 .  
 Person1:        How old were you ?  
 Person2:I was seventeen .  
 Person1:        So , did you go to college right away ?  
 Person2:No , because my English wasn't very good . I studied English for two years first .  
 Person1:        Wow , your English is really fluent now .  
 Person2:Thanks . Your English is pretty good , too .  
 Person1:        Yeah , but I was born here ! ! 

informal