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:       Julia , I saw two men fighting beside our door this morning .  
 Person2:I know them . They are the two brothers living next door .  
 Person1:        Brothers ? Do you know why they quarreled ?  
 Person2:It's said that the father's will caused the dissension among the two brothers .  
 Person1:        Is there anybody acting as mediator in the dispute ?  
 Person2:No , everyone keeps in mind that ' Don't intrude in a family dispute ' . 

formal