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:       Mr . Carmichael , this is Ellen Bower calling again . You had said I should call this week to schedule an interview with you .  
 Person2:That's right , Ms . Bower . How are you ? I'm not sure if I ’ ll be able to fit you in this week , I ’ m afraid .  
 Person1:        I understand , Mr . Carmichael . I'd be glad to make it some time next week .  
 Person2:All right , then . Why don't we say next Tuesday at 11:30 a . m . ? 

informal