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: Helen , you must be excited at going to America to study .
Person2:Yeah , I've been looking forward to it for ages .
Person1: What do your classmates think of it ?
Person2:They give me a lot of congratulations .
Person1: How long will you study there .
Person2:Oh , maybe three years . I will study and get the master degree first . Then I will decide whether I will stay there or come back .
Person1: Which university will you go to ?
Person2:Chicago University . My major is Economics .
Person1: Good luck !
Person2:Thank you !
Output:
informal