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:       You ’ re not going to believe what happened today . You ’ Ve got to promise to keep it to yourself .  
 Person2:Sure , what gives ?  
 Person1:        Today Mr . Leo threw Sally out of class !  
 Person2:On the level ?  
 Person1:        I ’ ll say . I knew Sally would finally show her true colors . When she got her final test results back from Mr . Leo , she started yelling at him . You should have heard her . I ’ Ve never seen anyone get so upset before . To make a long story short , it seems that Mr . Leo failed her because he caught her cheating .  
 Person2:That ’ s no laughing matter . That means she ’ ll have to take the whole course again . I can ’ t believe she ’ s going to have to start from the beginning .  
 Person1:        It serves her right ! 

informal