Given the task definition and input, reply with output. 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: Hi , Mary ! You're here already . Where's Harry ?
Person2:He isn't a punctual person . We may have to wait for a little while .
Person1: That should give us time for a cup of coffee . I'll go and get some .
Person2:Make it three cups . Here comes Harry .
informal