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 morning , Textile Import & Export Company .  
 Person2:Hello , this is Miller . I'm calling about the appointment with Mr . Zhang for this afternoon . Something's just come up , I'm afraid the appointment will have to be rescheduled , I'm very sorry about the change .  
 Person1:        That's all right . Maybe we can make another arrangement .  
 Person2:You're very kind to say so . Thank you . Do you think tomorrow morning would suit him ?  
 Person1:        I'm afraid there's a bit of a problem . In fact , he's booked up the whole week except tomorrow afternoon .  
 Person2:Tomorrow afternoon , Um ... you see , I've made an appointment with Mr . Comet for tomorrow afternoon . In order to meet Mr . Zhang , I have to cancel the appointment with Mr . Comet , I'm afraid .  
 Person1:        I'm terribly sorry , Mr Miller , but Mr . Zhang is really busy this week .  
 Person2:I understand . When do you think I can come and see him tomorrow afternoon ?  
 Person1:        Please let me check . Tomorrow afternoon - Yes , he'll be free from 2:00 tomorrow afternoon . Do you think it's convenient for you ?  
 Person2:Yes , that's quite all right for me . 

formal