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:       Sorry , sir . I came late because I had to send for the doctor for my grandfather . 
 Person2:I do sympathize with you , I assure you . 
 Person1:        Thank you , sir . 
 Person2:I hope your grandfather will recover soon . 

informal