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 do you feel about wearing name logos or slogans on your clothing ? 
 Person2:I've never really thought about it before . I guess it doesn't bother me . 
 Person1:        Do you think advertising has an influence on the choices you make when you're shopping ? 
 Person2:I guess so . I usually buy name-brand clothing , shoes , and electronic goods . How about you ? 
 Person1:        I actually try to avoid name-brand items . I can't stand it when big companies advertise their products all over the place ! 
 Person2:I know that advertisers are experts at persuading people to spend their money , I think brilliant items are usually higher quality than ~ grounds . 
 Person1:        I think is sensible to buy products that is high quality than others when you want to buy something that's going to last a long time , but I don't think it always makes sense . 
 Person2:Do you have a brand preference for anything ? 
 Person1:        I do for shower items like shower gel and shampoo , but I don't for higher-end items . 
 Person2:What do you think about the " impossible is nothing " billboard on the high street ? 
 Person1:        It's just a slogan for a famous company ; there's nothing really special about it . 
 Person2:I think it's a brilliant advert ! It really grabs my attention ! 
 Person1:        To each their own ! 

informal