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:       I hear your sister has had an accident , is it true ?  
 Person2:Yeah , it happened a week ago .  
 Person1:        That's a crying shame . It really is !  
 Person2:Fortunately , she's not seriously injured . 

formal