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:       ... I knew it . I always knew you were a lesbian ! 
 Person2:She's my roommate , not my date . The D-man , as in dork . 
 Person1:        Haha . Still got that great sense of humor , I see . Here's my card . I sell used cars . A car from us is a car you can trust ! 
 Person2:Alrighty then . Didn't you use to date Sheryl ? 
 Person1:        Sweet little lassie . Yep , broke her heart when the D-man told her he couldn't be a one-woman guy . 
 Person2:Oh ? I heard she dumped you . Anyway , she's right over there . Oh , Sheryl ! 

formal