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:       Does anyone mind me turning on the air conditioning ? It's hot in here .  
 Person2:Actually , I prefer if you didn't . Air conditioning makes me sneeze .  
 Person1:        All right . I'm opening the window , though , is that OK ?  
 Person2:Oh , sure . It's very stuffy in here . 

formal