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:       Good morning , Madam . Is everything OK ? Is there something I can assist you with ?  
 Person2:Thank you , yes . I'm not sure how to use this ATM , I usually go to a clerk and use my Bank Book . But today , I thought I'd try something new . I want to take some money out .  
 Person1:        Welcome to the electronic age ! I can run you through it ; it's what I'm here for .  
 Person2:Thanks so much . Right , I've put my card in . What now ?  
 Person1:        Just look at the screen here . It'll give you prompts , you see ? Now you need to enter your PIN number , then press ' enter ' to confirm it .  
 Person2:Then it'll give me my money ?  
 Person1:        Not right away , you need to decide what it is you want to do . The next thing is to select the service .  
 Person2:Here we are ' withdrawal ' , so I just press here ?  
 Person1:        Yes , then enter the amount you want .  
 Person2:Oh , as simple as that ! I shall never wait for a real person again , these machines are wonderful . 

formal