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:       Good evening . I've come to see Miss Morrison  
 Person2:Oh ! Good evening . I'm sorry , but she is not in . She's gone out to the theatre  
 Person1:        Oh ! I've just come back from Canada and I've brought a parcel from her parents  
 Person2:Please come in  
 Person1:        But you're busy , aren't you ?  
 Person2:I was preparing my supper but I've finished now .  
 Person1:        I can leave the parcel with you , can't I ?  
 Person2:Oh ! yes 

formal