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 evening .  
 Person2:Good evening . My wife and I would like a room , please . Is there any room available ? We don't have a reservation .  
 Person1:        Let me see . Yes , we have one room left . You're lucky . It's the last one .  
 Person2:Good . We're tired after driving all day , and we're looking forward to relaxing in a comfortable room .  
 Person1:        This room has two double beds . It's number 56 at the rear of the motel . It's quite a comfortable room .  
 Person2:How much is it for one night ? We only need it for tonight . We're going to continue our trip in the morning .  
 Person1:        It's forty-five dollars a night for two . Is anyone else traveling with you ?  
 Person2:No , it's just the two of us .  
 Person1:        Would you like to pay for the room in cash or with a credit card ?  
 Person2:Credit card . We don't like to carry much cash with us on our trips .  
 Person1:        Please fill out this registration card . Here is your key . You can park your car in front of our room.Check - out time is noon .  
 Person2:Thank you very much .  
 Person1:        Thank you , sir . Enjoy your stay with us . 

formal