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: Hello , Kith , can you and Alice come around this evening ? We prefer your coming .
Person2:I think we would be able to make it.What time shall we come ?
Person1: About 7 o'clock .
Person2:Shall we bring any thing ? Some wine ?
Person1: No , not really.Just bring yourselves . We would like to your presence .
A:
formal