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:       OK , Dead Man . If this doesn't start your engine , nothing will .  
 Person2:Thank you . Hey , do you know how espresso got its name ?  
 Person1:        No , I don't .  
 Person2:It's because of the way the steam and boiling water are pressed through the coffee . Es-PRESS-o , get it ?  
 Person1:        Uh , are you sure about that ? I thought espresso was an Italian word . 

formal