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:       I've got an idea . Let's make this game even more interesting .  
 Person2:How ? Do you want to play strip-trivia or something ?  
 Person1:        Well , if you want to ! Seriously , though , let's make a bet .  
 Person2:Why don't we just make it a friendly game ?  
 Person1:        Don't be such a chicken ! Whoever loses has to treat everyone to a movie . 

formal