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: Do you think the weather will be good this weekend ?
Person2:I heard it might rain .
Person1: Oh . That ' s a pity . I thought that we might go hiking in the hills .
Person2:Mmm ... Well we could go to that new art gallery instead .
Person1: Yes that might be a better idea .
Person2:Maybe we ' ll meet some of the artists too .
Person1: Ok - let ' s do that then !

Ex Output:
informal

Ex Input:
Person1: Well , humans could never make something like that .
Person2:Those poor Egyptians slaves worked so hard and you want to give aliens all the credit !
Person1: Be a little more open-minded , Stu ! Don't believe everything you read in your history books !
Person2:OK , but don't believe everything you see on The X-files , either !
Person1: Speaking of The X-files , it's on right now !

Ex Output:
informal

Ex Input:
Person1: Whose part do you think is best played ?
Person2:That of the old man .
Person1: You're absolutely right ! That's the very figure I like best .
Person2:Some of the scenes moved me into tears .

Ex Output:
formal