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: What's your name ?
Person2:My name is Wang Lin . My English name is Linda .
Person1: A nice name , isn't it ?
Person2:Yeah , like it very much . My name has become a part of me .
Person1: Where do you live ?
Person2:I live in the Haitian District .
Person1: Oh , It's really far from here . May I ask how old you are ?
Person2:Yes , I ' m 38 years old .
Person1: You look very young .
Person2:Thanks .
Person1: Where is your birthplace ?
Person2:My birthplace is Yentai .
Output:
informal