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:       Last weekend I didn't want to go out either , so I stayed at home and played video games by myself . It was really fun !  
 Person2:Oh yeah , that sounds pretty cool , I guess ...  
 Person1:        Yeah , I'm really into video games . In fact , all my friends are on the Internet . I've never met any of them in the real world .  
 Person2:Oh really ... well you must be very popular on the Internet . But it's true that it's nice to do some things in the comfort of your own home . 

informal