Definition: 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: I can bet the farm that you will regret about your decision . You cannot find a better one .
Person2:How can you be so sure ? You haven ' t been together with her , have you ?
Person1: No . But I ' m sure she is a good girl . My sixth sense tells me so .
Person2:Then try it yourself .
Output:
formal