Detailed Instructions: 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: Are you an American ?
Person2:Yeah .
Person1: Why don't you speak English ?
Person2:Oh , my mother is a German , so I can speak German .
Person1: Oh , do you like Chinese ?
Person2:Yeah , I'm eager to learn Chinese , but it is too difficult for me .
Person1: I want to study German . Can we exchange lessons ?
Person2:Very Good . I'd like to do that .
Person1: When will we begin ?
Person2:How about tomorrow night ?
Person1: That's all right .
A:
informal