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'.

Q: 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 .

A: formal
****
Q: Person1: Here's 30 yuan for my ticket .
Person2:Keep it . I'm buying tonight .
Person1: No , you can't do that .
Person2:Sure I can , my treat .

A: informal
****
Q: Person1: Are you having a good time ?
Person2:Oh , yes . It's a great party . There are some people I don't know , though .
Person1: Really ? Come on , I'll introduce them to you .
Person2:That would be great .

A:
informal
****