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:       Let's skip The X-files tonight , Fran . Okay ? Just this once ?  
 Person2:Let me guess . You want to watch the History Channel again !  
 Person1:        How did you know ! There's a program on ancient Egypt tonight .  
 Person2:Well , I guess I could tape The X-files and watch it later ...  
 Person1:        Look , it's starting !  
 Person2:Mysteries of the Pyramids . Didn't we watch this program last week ? 

informal