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:       Do you know that scientists replicated a sheep into an identical clone . 
 Person2:I heard about that . It was successful . 
 Person1:        It's a big jump in science . Maybe more like a leap . 
 Person2:I should say , it stunned me . I can't imagine what they will think of next . 

formal