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:       Why don ’ t we go the cinema tonight ?  
 Person2:That sounds good but I don ’ t know what ’ s on .  
 Person1:        I think there ’ s a very romantic new film starring Hugh Grant . Let ’ s go and see that .  
 Person2:Ok , that ’ s a good idea . Where shall we meet ?  
 Person1:        Well how about meeting at my place ?  
 Person2:That sounds good . I ’ ll call you once I arrive . 

informal