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:       Would you like to go to the movies tonight ? 
 Person2:Well , I just saw a horror movie last night . It almost frightened me to death . 
 Person1:        Well , we could see something different like a detective film . 
 Person2:I don't care for a detective film . It also makes me nervous . 
 Person1:        How about a comedy ? 
 Person2:No , I don't think comedies today are natural or cheerful . 
 Person1:        How about a love story then ? 
 Person2:No , romance is boring . 
 Person1:        What's you opinion ? 
 Person2:Let's go to see a war movie , shall we ? 
 Person1:        Really ? 
 Person2:Certainly . Is there anything wrong ? 
 Person1:        No , but I can't imagine that a girl like you would wonder to see a war movie . 

informal