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:       Hey , what's the matter ?  
 Person2:It doesn't matter . I just feel a little dizzy .  
 Person1:        Are you sure that this has nothing to do with sleep ?  
 Person2:I don't know . 

formal