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:       What else can I do for you today ? 
 Person2:Well , I've been browsing online , but I ’ m not really sure what to do about payment . I would like to know what the most convenient way to do it is . 
 Person1:        We'll have our own Secure Internet Banking Service . What it is , is a sort of online financial service for enterprises and individuals , so you could get it . It's for doing all types of e-business . 
 Person2:That does sound interesting . How can I get this service ? 
 Person1:        Easy as pie ! We can get everything set up for you right away . Then , you'll be shopping securely online in no time at all . 

formal