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:       So Emily , do you still want to see a movie together this weekend ?  
 Person2:Well , what do you want to see ? I don't think there are many good movies out right now .  
 Person1:        Mmmm ... I know ! We can go to a really bad sci-fi movie and sit in the back of the theater and make fun of it . What do you think ?  
 Person2:Now that's a great plan . It's a date ! 

informal