Instructions: 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: So Kevin , what is your type ?
Person2:I like girls who like to have fun , and aren't too serious .
Person1: I agree . I like guys that can make me laugh .
Person2:That's true . Having a very serious boyfriend or girlfriend can be boring .
Output:
informal