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:       How's your new apartment ?  
 Person2:I thought it was in a quiet neighborhood , but it isn't .  
 Person1:        What's wrong ?  
 Person2:One of my neighbors has a dog .  
 Person1:        Does it make a lot of noise ?  
 Person2:It barks all night long . 

formal