Detailed 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'.
Q: Person1: Have you seen Harry ?
Person2:No . As far as I can remember he was supposed to be on a business trip to Lisbon .
Person1: Yes , but he was supposed to be back by now .
Person2:Maybe you'll call his home .
A:
formal