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 was impressed with how smart he was and he has a great sense of humor . 

informal