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:       Excuse me . I'm looking for an old music box . 
 Person2:Any particular decade ? 
 Person1:        Something made in the ' 20s would be nice . 
 Person2:We had seven , but we sold one this morning . 
 Person1:        Are dancing figures a part of any of the boxes ? 
 Person2:You're in luck . Two of them have dancing figures . 
 Person1:        Oh , these are great . I think I'll take this one . 
 Person2:Yes , that one is very nice . 
 Person1:        Now , does this come with a warranty ? 
 Person2:I'm sorry , but you just have to take your chances . 
 Person1:        That doesn't surprise me . 
 Person2:Even if it doesn't work , it's a beautiful collectible . 

informal