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:       Lisa , I'm so glad to see you . How are you doing ?  
 Person2:Fine . I miss you so much , uncle Benjamin .  
 Person1:        Me too . We haven't seen each other for years .  
 Person2:It's been 3 years now .  
 Person1:        How time flies ! Now you are a college student out of a little girl .  
 Person2:How is aunty Shirley ?  
 Person1:        Couldn't be better .  
 Person2:How has May been ?  
 Person1:        She's been good . She is in grade one in Joy Chain high school . And she dreams to be a volunteer in 2008 . 

informal