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:       May I have your attention please ? 
 Person2:Would you please be quiet , Ladies and Gentlemen ? 
 Person1:        Well , my speech isn't very long . Would you please ... 
 Person2:Quiet everybody ! 

informal