Q: 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'.
Person1: Mr . : Are you Mary Lin ?
Person2:Yes .
Person1: Mr . : I'm Mr . Rogers , your homeroom teacher .
Person2:Where should I sit ?
Person1: Mr . : Why don't you sit behind Brad ?
Person2:Who's Brad ?
Person1: Mr . : He's that guy in the blue shirt .
Person2:When does the first period begin , by the way ?
Person1: Mr . : As soon as the bell rings after the morning announcement .
A:
formal