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'.

Ex Input:
Person1: Shall we go for a drive today ?
Person2:It feels like there's going to be rain later .
Person1: Maybe you're right .
Person2:We'll go tomorrow .

Ex Output:
informal

Ex Input:
Person1: I heard that James was fired because he got a keep back of 20 thousands dollars from a vender .
Person2:That ' s open secret .
Person1: But mine could be a lie for his job .
Person2:How did you know that ?
Person1: A little bird whispered to me . Keep that to yourself .

Ex Output:
formal

Ex Input:
Person1: Hey , let's arm wrestle !
Person2:Not now .
Person1: Chicken ! You're afraid I'll beat you .
Person2:Are you kidding ? I just feel tired right now .

Ex Output:
informal