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:       Is this your brother-in-law ?  
 Person2:Yes , he married my sister ten years ago .  
 Person1:        From his looks , I'd say he's a man of character .  
 Person2:Yes , my sister loves his personality . 

formal