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:       I'm afraid I've spilt ink all over the table-cloth . 
 Person2:Oh , never mind about that . 
 Person1:        I'm terribly sorry . Won't you let me pay for it ? 
 Person2:No , I won't hear of it . 

formal