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:       What exactly is the problem with the latest lot ? 
 Person2:We are faced with the problem that part of the consignment is unacceptable . We assume that damage occurred during the consignment was in your care . 
 Person1:        But we can't accept your damage claim . 
 Person2:Why not ? 
 Person1:        You didn't note the damage on the bill of lading . 

formal