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:       Mary , I heard you moved again .  
 Person2:Yeah . I could not stand living here . There is always much noise in the neighborhood .  
 Person1:        You mean noise ? How could it be ?  
 Person2:You know , on weekends when we wanted to have late rise in the morning , our neighbour started to raise Cain . 

formal