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:       Hey , if you're not busy this weekend , would you like to go see a movie ?  
 Person2:Sounds good . What should we see ?  
 Person1:        How about that European movie ?  
 Person2:You mean the one starring John Travolta ?  
 Person1:        Yeah , that's the one I've heard the special effects and the plot are outstanding .  
 Person2:Sounds like an interesting film . Let's meet at five o'clock on Saturday .  
 Person1:        Okay , see you then . 

informal