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:       Balista , pull me a ristretto .  
 Person2:What ? You're suddenly some kind of coffee snob now ? What's a ristretto anyway ?  
 Person1:        It's basically a very strong espresso . Half the water pulled through the same amount of beans . Pure coffee essence .  
 Person2:Sounds like it must be just full of caffeine . I want one of those instead !  
 Person1:        You fiend . It's about the flavor , not the fix . Why don't you just crush some caffeine pills and start doing lines ? 

formal