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 . What can I do for you ?  
 Person2:Hello . I'm here to get my salary .  
 Person1:        I see . Do you have your Current All-in-one Passbook with you ? I'll need your password for this transaction .  
 Person2:No problem .  
 Person1:        And how much of your salary would you like ?  
 Person2:I think just 3,000 RIB will be enough . 

formal