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:       Do you drink the Robust Milk every day ? 
 Person2:Not every day , but occasionally . 
 Person1:        It will make you as fit as a fiddle . 
 Person2:I don't believe ads.What ' s more , I'm already in perfect health . 

formal