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 used to be down on the sales people until I saw her in action .  
 Person2:She means business , for sure .  
 Person1:        Most salespeople seem like half-brains . Zina's definitely an exception .  
 Person2:We'd better get back to work .  
 Person1:        Yeah , I'm not too worried about Vince , but I'd hate to face Zina if we don't deliver ... 

informal