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 need to eat something . 
 Person2:You just ate . 
 Person1:        I know , but I'm hungry again . 
 Person2:There's no food left from dinner . 
 Person1:        I think I'm going to go make myself a snack . 
 Person2:Do you know what kind of snack that you want ? 
 Person1:        I'm not exactly sure . 
 Person2:Why don't you make yourself a sandwich or something ? 
 Person1:        I have no idea what kind of sandwich I want to make . 
 Person2:A PB & J is pretty easy to make . 
 Person1:        I'm going to do that . 
 Person2:Knock yourself out . 

formal