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: Shall we for go out for a meal this evening ?
Person2:I don ' t really mind .
Person1: We can go to that new Chinese restaurant .
Person2:I suppose I could .
Person1: Come on , let ' s try it .
Person2:All right . If you really want to .
Output:
informal