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:       Mary , how was your date with john ?  
 Person2:It's OK . It seems we have a lot in common .  
 Person1:        Oh , really ? That is great news . What does he look like ?  
 Person2:He is tall and slim , fair-haired .  
 Person1:        Sounds like he is pretty cute . What do you think of him ?  
 Person2:He is a nice guy and very considerate . I am impressed with how smart he is and he has a great sense of humor .  
 Person1:        Oh , it's love at first sight . When will you see each other again ?  
 Person2:He didn't say , but he said he would call me .  
 Person1:        Maybe he is busy with his work . Just wait and try not to think about it too much !  
 Person2:Oh , David . Stop it ! I am a bit nervous ! What should I do if he doesn't call me ?  
 Person1:        Come on , Mary , you're a total catch . I bet he will call you . Don't worry .  
 Person2:Thank you , David . You're always so encouraging .  
 Person1:        That's what friends are for . 

informal