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:       I'm in 507 , and I have a big problem .  
 Person2:I'm so sorry . Kindly tell me what the problem is , sir .  
 Person1:        Everywhere I look , I see cockroaches .  
 Person2:Perhaps you could look again , sir , to double-check .  
 Person1:        The next cockroach I see will be number ten .  
 Person2:Mr . Sandals , I've worked here five years without seeing one cockroach .  
 Person1:        I've already suffered enough without listening anymore to you !  
 Person2:You're right , sir . Please let me transfer you to my supervisor 

informal