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: What do you think of your teacher ?
Person2:He's very strict with us .
Person1: And I hear he gives very good lectures .
Person2:Indeed . He's strict with himself , too . We can see every lecture of his is well-prepared .

A: informal
****
Q: Person1: Charles , have you finished your homework ?
Person2:Not yet , Grandma , What's the matter ?
Person1: I want you to have a walk with me .
Person2:I'll finish soon .

A: formal
****
Q: Person1: Which school is your children in ?
Person2:She is now in a private school .
Person1: Oh , it costs too much . It's more expensive than the public school .
Person2:It's idea of my husband . He is always banging the drum for better schools .
Person1: But the private school amount to better schools .

A:
formal
****