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:       A woman after my own heart ...  
 Person2:OK , Mr . Coffee Connoisseur , so what's the next step in the coffee-making process ?  
 Person1:        Well , step two is grinding the coffee beans . I've roasted three different types of beans .  
 Person2:Let me guess , Mocha , Mandheling , and Santos !  
 Person1:        Yep , my own special blend ! You can tell by just smelling them ?  
 Person2:No , I just read the names off the packages ... Ha ! 

informal