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:       Reservation , may I help you ?  
 Person2:Yes , I would like to make a reservation for May 3rd .  
 Person1:        For how many people ?  
 Person2:Only one .  
 Person1:        May I have your name ?  
 Person2:John . 

formal