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'.

Example Input: Person1: Can I talk to you for a moment , manager ?
Person2:Yes , of course . What is it ?
Person1: I've decided to leave .
Person2:Leave ? Why ?
Person1: I've worked here for two years . And I want to do something different .
Person2:What do you mean by something different ?
Person1: I want to live abroad and learn to speak a different language .
Person2:I'm really sorry . But I understand .
Person1: Thank you , manager .
Example Output: formal

Example Input: Person1: You are in love with Mary , right ?
Person2:You are pulling my legs !
Person1: I am not blind . Anyone can see that with half an eye .
Example Output: formal

Example Input: Person1: I'm exhausted . My new exercise is so hard .
Person2:I think it is easy . I could work in your class with no problem .
Person1: You thing so ?
Person2:Oh , without doubt.When is the next class ?
Person1: Tomorrow morning.Try it .
Person2:No problem .
Person1: Are you going to this class this morning ?
Person2:Of course , easy.No sweat .
Person1: You're no able to move after this class .
Person2:Are you kidding me ? It's going to be up a piece of cake .
Person1: You want to bet ?
Person2:Yeah , what't the bet ?
Person1: I bet I can go one hour in your class this morning and not feel a thing .
Example Output:
formal