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:       Good afternoon , madam . Can I help you ?  
 Person2:Yes , please . Have you any vacancies for tonight ?  
 Person1:        Do you have reservations with us ?  
 Person2:No , I don't think so .  
 Person1:        Sorry , madam . We don't have vacancies at the moment . 

formal