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 feel that Bob ’ s father-in-law is a hard nut to crack .  
 Person2:You have taken words out of my mouth . He is a tough customer .  
 Person1:        But his daughter is a very nice girl . 

informal