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 are you doing to your house ?  
 Person2:We're redecorating our living room .  
 Person1:        What are you going to do to it ?  
 Person2:First , we're going to change the curtains , then we're going to paint the walls .  
 Person1:        What colour are you going to paint them ?  
 Person2:Pale yellow .  
 Person1:        What else are you going to do ?  
 Person2:We're going to put in some new furniture . 

formal