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:       What happened to you yesterday ?  
 Person2:Oh I fell over on the way to work .  
 Person1:        Oh I see . So that ’ s why you didn ’ t come in ?  
 Person2:Yes and I broke my phone too so I couldn ’ t call you .  
 Person1:        Oh dear , that sounds terrible .  
 Person2:It was ! But the worst thing was I tore my best shirt .  
 Person1:        Oh dear . Well , get well soon and try to be more careful in future . 

informal