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:       How can I help you today ?  
 Person2:I want to sign up for some funds units . How do I go about it ?  
 Person1:        Have you got some ID and your cash card ?  
 Person2:Yes . I've already got a fund account with you too .  
 Person1:        How many more fund units would you like to purchase today ?  
 Person2:I'm not quite sure . You see , I already have more than 5,000 RIB in my cash card , but I really don't know how much I should get .  
 Person1:        The usual minimum purchase is 5,000 RIB .  
 Person2:That settles it then . 5,000 RIB it is , thanks . 

formal