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:       So did you get in touch with your brother ?  
 Person2:No , not yet . I'm really worried .  
 Person1:        Well , it'd be foolish to call the police . He probably just went away overnight .  
 Person2:Maybe you're right . But I'm still worried . 

formal