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 , Lucy , you are very popular with people around you , what are your tricks ?  
 Person2:Thank you for saying so . I don ’ t know , probably because I like sharing my experience and knowledge with them . I think this kind of communication helps to improve our work efficiency and also helps to get along with colleagues .  
 Person1:        Sharing knowledge can be very settled and some second stances . People may think you are telling them how to do their work . If they take it personally , they feel angry at you and even become reluctant to support you at work .  
 Person2:That is true . Some people will misunderstand your intention and lets you do it in the long threatening way . For example , it is not sensible at all to arguing with the others or correcting someone in front of other people . To show your friendliness and willingness to share is much more important than to show off .  
 Person1:        You are quite right . Thank you for sharing your experience with me . I learned a lot .  
 Person2:You ’ re welcome . 

informal