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:       Hey , Ann . You don't have a pen , do you ?  
 Person2:Sure , here you go .  
 Person1:        Thanks . I don't suppose you have some paper , too .  
 Person2:Of course . There you are .  
 Person1:        Thanks so much . I owe you one . 

informal