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:       Hi , Peter . I ’ m afraid I can ’ t make it to dinner tomorrow night .  
 Person2:Oh , why not ?  
 Person1:        It ’ s just I ’ m not feeling well . I think I ’ m coming down with a cold or something .  
 Person2:Oh , I ’ m sorry to hear that . Hey , don ’ t worry about the dinner . We ’ ll do it some other time . But you take care of yourself .  
 Person1:        Thanks . I will . 

informal