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:       Hello , Is this room service ? 
 Person2:Yes , May I help you ? 
 Person1:        This is the room 1425 , we asked for the room service an hour ago . 
 Person2:we are very sorry to cause you a lot of inconvenience . 
 Person1:        What's the matter ? 
 Person2:We're rather busy right now . It will take another 15minutes 
 Person1:        Is it really going to take that long , will you rush the order ? 
 Person2:I'm afraid it will take 15 minutes at most . 
 Person1:        ha , well , we have no choice . 

formal