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:       Hello ! 
 Person2:Oh , hi ! 
 Person1:        Please allow me to introduce myself . My name is Tom . 
 Person2:Pleased to meet you . My name is Alice . Did you just move in next door ? 
 Person1:        Yes , I did . Have you lived here long ? 
 Person2:Me ? I guess so . I've lived here for about six years now . Have you lived in America very long ? 
 Person1:        No , not really . When I left Vietnam , I came to America and I lived with a cousin in Dallas for two years . Where do you work , Alice ? 
 Person2:I teach mathematics at a college . What do you do ? 
 Person1:        I am an accountant at a company . 
 Person2:Well , Tom . It's good to meet you . I have to go now . I am teaching a class this evening , and I need to get to the college . 
 Person1:        It's nice meeting you too , Alice . 
 Person2:See you around ! 
 Person1:        Goodbye , Alice . 

informal