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: Happy Mother's Day , Mom !
Person2:Thanks ! These are beautiful . You shouldn't have !
Person1: Of course I should have ! You certainly deserve them ! You put up with all of us .
Person2:I forgot what I put up with . In that case , I do deserve these flowers .
Output:
informal