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 here to open a Current Account with your bank .  
 Person2:That's no problem at all , but could you fill in this and I'll need to see some ID .  
 Person1:        Here you go . Is there a minimum amount I need to pay in ?  
 Person2:Yes , there needs to be at least 1 RIB paid in to open a new account . Also , you will need to choose a secret identity code to ensure no one else can enter your account .  
 Person1:        OK , how long does it need to be ? I'm not very good with remembering long numbers .  
 Person2:Just 6 digits . 

formal