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:       Hey Eve , how are you ?  
 Person2:I ’ m fine , Celia . And you ?  
 Person1:        I ’ m ok . I ’ m so busy !  
 Person2:Do you have a lot of homework ?  
 Person1:        Yes . Don ’ t you ?  
 Person2:Of course I do !  
 Person1:        Which class are you working on right now ?  
 Person2:I ’ m studying for my chemistry exam tomorrow .  
 Person1:        Are you in Mrs Green ’ s class ?  
 Person2:Yes . Are you ?  
 Person1:        Yes . We must have the same exam tomorrow !  
 Person2:Do you want to study together ?  
 Person1:        Sure . This library is too quiet though .  
 Person2:Do you want to go to and empty classroom ?  
 Person1:        That sounds good .  
 Person2:Ok . Let ’ s go ! 

informal