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:       Are you going to the party on Saturday ?  
 Person2:I was thinking about it . Are you ?  
 Person1:        Yeah , I heard it's going to be a lot of fun .  
 Person2:Really ? Well , what time does it start ?  
 Person1:        It starts at 8  
 Person2:Well , who all is going to be there ?  
 Person1:        Everyone from school .  
 Person2:How do you know it's going to be so fun ?  
 Person1:        This party is going to have a DJ , food , and drinks .  
 Person2:Wow , that does sound like it's going to be fun .  
 Person1:        So am I going to see you at the party ?  
 Person2:Yeah , I will be there . 

informal