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:       Ms.Green , are the schools more or less similar everywhere throughout the United States , or do they differ in various sections ?  
 Person2:The system of public schools is fairly uniform everywhere throughout the United States .  
 Person1:        Do most students in the United States attend private schools or public schools ?  
 Person2:Most public schools in the United States are very good , and the majority of students attend the public schools .  
 Person1:        Which students go to private schools , then ?  
 Person2:Children needing special instruction . Children whose parents can afford to send them to private schools , and children whose parents want them to receive a religious education .  
 Person1:        But are the public schools good everywhere ?  
 Person2:No , public schools can be very different . Even in the same city .  
 Person1:        Dose it cost anything to attend the public schools ? Are there any restrictions as to who may and may not attend ?  
 Person2:The public schools in the United States are free to everyone and there is no cost to the student . In most states , even the textbooks are free . There are no restrictions as to color , race , or religion.Any student wishing to attend the public schools may do so . 

formal