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:       It ’ s freezing in here ! Can I turn up the heat ?  
 Person2:Don ’ t touch that thermostat ! You don ’ t pay the bills around here !  
 Person1:        Dad ! Are you serious ? What ’ s the point of having central heating if we can ’ t use it ! Look , I can see my breath !  
 Person2:Put on a sweater ! I ’ m not gonna let you run up my heating bill just because it ’ s a bit chilly .  
 Person1:        Dad ! I ’ m gonna catch a cold !  
 Person2:When I was your age , my parents didn ’ t have central heating like you do ! We had a furnace in the center of the living room and that was it . We used it to cook , heat the house and even dry our clothes ! We never caught a cold . You should be grateful ! 

informal