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'.

Person1: It looks like it's going to be sunny .
Person2:Yes , it's much better than yesterday .
Person1: They say we're going to get some rain later .
Person2:Oh , let's just hope it stays warm .
informal