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:       Elegance Hotel , is there anything I can do for you ?  
 Person2:Hello , I would like to make a reservation for four nights next week , from Tuesday to Friday .  
 Person1:        All right , single or double room ?  
 Person2:Single room with a bath room , please . I would like a room with a view of the whole city .  
 Person1:        All right . We have a single room available right now .  
 Person2:What's the rate , please ?  
 Person1:        578 yuan a night , plus VAT , including air-conditioner and TV .  
 Person2:Does that include breakfast ? Can I make calls on outside line ?  
 Person1:        Yes , it includes English breakfast . For the phone , I am afraid you can not .  
 Person2:OK , that's fine . Could you hold it for me ?  
 Person1:        Would you like to confirm the reservation ? 

formal