Definition: 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'.
Input: Person1: Is my hair done yet ?
Person2:Yeah , I just need to make the final touches .
Person1: How long until you're finished ?
Person2:I'm finished . What do you think ?
Person1: I like my hair so much .
Person2:Do you really ?
Person1: It's beautiful .
Person2:Well , thank you very much .
Person1: How much is it for my hair ?
Person2:You owe me $ 55 .
Person1: Thanks for everything .
Person2:You are very welcome . Come back again .
Output:
informal