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:       I've got a bone to pick with you over your last shipment to Dalian . A part of the goods were damaged in transit . 
 Person2:I'm very sorry to hear that . 
 Person1:        Please handle future shipments with more care . 
 Person2:We'll take great care . 

informal