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 .
Output:
formal