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'.
Example: Person1:      Hey man , you wanna buy some weed ?  
 Person2:Some what ?  
 Person 1:Weed ! You know ? Pot , Ganja , Mary Jane some chronic !  
 Person2: Oh , umm , no thanks . 
 Person1:      I also have blow if you prefer to do a few lines . 
 Person2: No , I am ok , really . 
 Person1:      Come on man ! I even got dope and acid ! Try some ! 
 Person2: Do you really have all of these drugs ? Where do you get them from ? 
 Person1:      I got my connections ! Just tell me what you want and I ’ ll even give you one ounce for free . 
 Person2: Sounds good ! Let ’ s see , I want . 
 Person1:      Yeah ?  
 Person2:I want you to put your hands behind your head ! You are under arrest ! 
Example solution: informal
Example explanation: Based on the conversation, we can see that there is a presence of exclamation which is not present in a formal discussion. Therefore this is an informal conversation

Problem:  Person1:       do you mind if I sit here ?  
 Person2:no , of course not . Go ahead .  
 Person1:        don't I know you ?  
 Person2:yes , now that you mention it , I think we had a chemistry class together in high school .  
 Person1:        you're right ! How are you ? It's been a long time !  
 Person2:What did you do after high school ?  
 Person1:        I went straight to university afterwards . What about you ?  
 Person2:I took a year off to go travelling .  
 Person1:        that sounds exciting . Where did you go ?  
 Person2:I went all over the world . It was the best year of my life . Where did you go to school ?  
 Person1:        I went to a small school in Connecticut . It has a very good reputation for its languages department .  
 Person2:Oh , did you study a foreign language ?  
 Person1:        yes , I got a grant to study Chinese .  
 Person2:that's a very difficult language to learn , isn't it ?  
 Person1:        it is , but it's very rewarding .  
 Person2:so you can speak Chinese ?  
 Person1:        I can , but not as well as I'd like to . I'll be studying Chinese until the day I die !  
 Person2:I think most languages take a lifetime to learn well . 

Solution: informal