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:       Why is there no water coming out when you turn on the faucet ?  
 Person2:Not even a single drop ?  
 Person1:        Well , it's just drip drip drip . But that's not water .  
 Person2:I don't know . Since yesterday morning , the water pressure has dropped to a little more than a drip .  
 Person1:        Did you call the apartment management yet ?  
 Person2:Yeah , I called and they said they'd send someone over .  
 Person1:        How long ago did you do that ?  
 Person2:It was 36 hours ago .  
 Person1:        That's outrageous ! I just don't understand why they're not on top of this . 

informal