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 , Maintenance Department .  
 Person2:Hello . I'm having a problem with my air conditioner .  
 Person1:        Which air conditioner ?  
 Person2:The one in the bedroom .  
 Person1:        What seems to be the problem ?  
 Person2:There's no cold air coming out .  
 Person1:        May I have your room number , please ?  
 Person2:512 .  
 Person1:        OK , we'll send someone up to check it .  
 Person2:I'm going out right now . But that's all right , you can come when I've gone .  
 Person1:        Fine . The housekeeper will open the door and stay in the room with the repairmen . 

formal