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:       Excuse me . I would like to book a table at 13:00 .  
 Person2:Sure , for how many ?  
 Person1:        Three seats , please .  
 Person2:May I have your name ? 

formal