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 do you shoot pool ?  
 Person2:You have 16 balls on the table , 7 solid colored , 7 striped colored , a black 8 ball , and the white ball .  
 Person1:        And ?  
 Person2:You hit the white ball with your cue . The white ball hits the colored balls . And you want to get the colored balls into the pockets .  
 Person1:        How do you know whether you should hit the solid or the striped one ?  
 Person2:At the beginning , it does not matter , but once someone gets one ball in , it is set .  
 Person1:        Can I get the black ball in ?  
 Person2:The black ball has to be the final ball in the pockets .  
 Person1:        Let's go and try now ! 

informal