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:       May I have a word with you ? 
 Person2:Certainly . 
 Person1:        When will you be free ? 
 Person2:Come by any time . 
 Person1:        Shall I say around ten o'clock ? 
 Person2:Yes , I'll be waiting for you in my home by 10:00 . 

informal