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:       Hi ! I'm Hong lei . What's your name ?  
 Person2:Hello , Hong Lei . My name's Ricky .  
 Person1:        Hi Ricky . Are you a new student here ?  
 Person2:Yes , I had my first lesson this morning . Are you a new student too ?  
 Person1:        No , I've been here for six months .  
 Person2:Six months . That's a long time .  
 Person1:        It's not so long really . What class are you in ? Intermediate or ... ?  
 Person2:Intermediate Three . And what about you ?  
 Person1:        I'm in Advanced One . Who's your teacher ?  
 Person2:I can't remember her name , but she's got curly red hair .  
 Person1:        Ah ! Does she wear glasses ?  
 Person2:Yes , I think so .  
 Person1:        That's probably Anne Wallis .  
 Person2:Yes that's right . Do you know her ? Is she your teacher too ?  
 Person1:        No . But she taught me last term . How long have you been here ?  
 Person2:Only a week .  
 Person1:        Wow , not long . Where do you live ? With a family ?  
 Person2:Well , I'm staying at the YMCA at the moment . I'm looking for somewhere more permanent . Do you know of any good places ?  
 Person1:        Yes . Actually my friend has a spare room in here apartment and she's looking for a flatmate . Would you like her phone number ?  
 Person2:That would be great ! Thanks for your help . Can I buy you coffee ? 

informal