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:       Hi , Carlos . What are you doing this afternoon ?  
 Person2:Working . Why ?  
 Person1:        Well . I was just wondering if you would come by and give me a hand with the fliers for next week ’ s party .  
 Person2:I ’ m sorry , Melissa . I really can ’ t today . I ’ Ve just got too much going on . Maybe tomorrow . 

formal