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 , Mary , can you cut that out ?  
 Person2:Cut what out I ’ m not doing anything .  
 Person1:        The tapping of your pen on your desk . It ’ s driving me crazy .  
 Person2:Fine ! By the way would you mind not slurping your coffee every time you have a cup !  
 Person1:        I don ’ t slurp my coffee . And plus , how can you hear it when you ’ re shouting into your phone all the time ?  
 Person2:You ’ Ve got to be kidding me ! You ’ re complaining about me talking on the phone when you go out for a cigarette break ten times a day to shoot the breeze ?  
 Person1:        Look , we have a lot of accumulated anger from working in these conditions , and it ’ s probably okay to let off steam once in a while . But , it ’ s probably not a good idea to keep it up I ’ m willing to forgive and forget and if you are .  
 Person2:Fine . Let's call a truce . I'll try to more considerate and to keep the noise down .  
 Person1:        Yeah , I ’ ll try to do the same.So , I was wondering you wanna go out to dinner Friday night ? 

informal