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: Good morning , Mr Wang .
Person2:Good morning . What time is it now ?
Person1: It's just nine o'clock .
Person2:I'm on time today
Person1: Yes , you're on time . Are you often late ?
Person2:Yes , quite often .
Person1: You must leave home earlier today .
Person2:No , I left home at 6:30 as usual .
Person1: Why are you so early today ?
Person2:Because the traffic is not crowded .
informal