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:       Daniel , you can't spit the gum everywhere .  
 Person2:Come on , just a little piece .  
 Person1:        Do you know how many people chew gum everyday ?  
 Person2:I have no idea .  
 Person1:        Just in Beijing , people consume 300,000 pieces of gum every day .  
 Person2:That's amazing .  
 Person1:        If all the people spit out the gum like you , the whole world would become a big trash can .  
 Person2:Come on , you are making too big deal out of this .  
 Person1:        I just want to remind you to behave yourself .  
 Person2:OK , dear sister , I see . This kind of thing will not happen again . 

informal