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: Is there a bookstore near here ?
Person2:Yes , it's straight ahead around the corner .
Person1: Thank you very much .
[A]: informal

[Q]: Person1: Good evening , I'm so happy you could come .
Person2:Thank you for inviting me .
Person1: What would you like to drink ?
Person2:A glass of white wine would be fine , thank you .
[A]: informal

[Q]: Person1: I think Bill Clinton is a good president .
Person2:But he has the sex scandal .
Person1: Well . Maybe he isn't a good husband , but he is a successful president .
Person2:I agree . He is also an excellent speaker .
Person1: Yes , he is . Of course he makes mistakes , but who doesn ' t .
Person2:yeah , it ' s fair to say so .
[A]:
informal