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'.
Input: Person1: Welcome to China , Mr . Martin .
Person2:Thank you so much . I have been expecting to come to China .
Person1: I am very glad that you say so . We have prepared a typical Chinese dinner this evening .
Person2:Oh , you needn't do that .
Person1: My pleasure .
Output:
informal