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:       Dick , I ’ Ve decided not to rent that house .  
 Person2:But yesterday you said you would rent it .  
 Person1:        I ’ Ve changed my mind .  
 Person2:Why is that ?  
 Person1:        Well , I think maybe I should find a house that is closer to where I work .  
 Person2:Maybe you ’ re right . 

formal