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:       The police need our help finding a robber .  
 Person2:How do you know ?  
 Person1:        The TV news is reporting a bank robbery .  
 Person2:Do they know what the robber looks like ?  
 Person1:        Yes , he's 6 feet tall , 200 pounds , black hair , and about 30 years old .  
 Person2:What race is he ?  
 Person1:        They didn't say .  
 Person2:The TV news doesn't tell us the race anymore .  
 Person1:        Of course not . That would be racist .  
 Person2:But how can we identify someone if we don't know their race ?  
 Person1:        Don't ask me .  
 Person2:Then they also shouldn't tell us if the robber is male or female , because that is sexist . 

formal