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:       How about going to the cinema tonight ?  
 Person2:That's great . What's on tonight ?  
 Person1:        I am not sure about the name of the film , but I know it's a romantic one .  
 Person2:Romantic ? I am afraid I like thrillers better .  
 Person1:        Don't you think it's too bloody ?  
 Person2:On the contrary , very exciting . 

informal