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:       how's it going ?  
 Person2:I'm in a really good mood , actually . How about you ?  
 Person1:        to be honest , I'm a bit fed up .  
 Person2:what's wrong ?  
 Person1:        well , my boyfriend was supposed to call me last night , but he never did .  
 Person2:that's too bad . I'm sure there's a logical explanation for it . Don't be too upset about it .  
 Person1:        the thing is , this isn't the first time he's promised to do something and then didn't .  
 Person2:I see how that can get a bit annoying .  
 Person1:        a bit ? I'm extremely annoyed that he didn't phone me when he promised me that he would ! He's such a liar .  
 Person2:so what are you going to do about it ?  
 Person1:        I don't know . I've got mixed feelings about it . On the one hand , I really want to end it with him , but on the other hand , I don't want to be without him .  
 Person2:what do you think would make you happier ?  
 Person1:        in the long run , I think breaking up with him would make me much happier , but I know that I'll be depressed about it for a few weeks first .  
 Person2:relationships can be confusing sometimes .  
 Person1:        what would you do if you were me ?  
 Person2:I'd call him and dump him now ! You deserve better than him ! 

informal