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:       Excuse me , sir , the toilet in my room doesn't flush .  
 Person2:I am sorry , sir . Can you tell me your room number ?  
 Person1:        812 .  
 Person2:Is there anything else I can do for you ?  
 Person1:        The tap is always driving . I can't sleep well .  
 Person2:OK , we will send a repairman to your room right now . 

formal