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:       I'm the coolest high-tech stud around ...  
 Person2:Why ? Do you have a robot girlfriend ?  
 Person1:        Not yet ... I got an MP3 player and a set of stereo headphones .  
 Person2:So you can download MP3 music from the Net and record it onto the MP3 chip ?  
 Person1:        Yep ! And take it with me anywhere ! And the music is free !  
 Person2:Let me see it ! It's so small ! 

informal