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:       Have you heard about Anlesen David ?  
 Person2:No , have they have another fight ?  
 Person1:        No , they got engaged .  
 Person2:You must be joking.Those two .  
 Person1:        Well , my dear . I didn't believe either.But got it straight form the horse's mouth.Davi called me this morning .  
 Person2:So when did this happen ?  
 Person1:        Last weekend , while they were on the Sik trip .  
 Person2:Well , I believe it now , and when are they are getting marry ?  
 Person1:        Next june .  
 Person2:I can hardly believe it . 

informal