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 am keen on a coat on www.dingding.com . But it requires having an online banking account . Is it necessary ?  
 Person2:Indeed . Online banking enables you to make on-line shopping .  
 Person1:        Do you know how to get the bank account ?  
 Person2:Bring your ID card and fill out a form . That will be fine .  
 Person1:        So easy .  
 Person2:I think online banking can change your money habits and it is quicker than ATM processing speed .  
 Person1:        My shopping life will be more convenient . 

informal