Detailed 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'.
Q: Person1: Can you imagine a boat letting in the river ?
Person2:That would be terrible .
Person1: Sure thing . I have an experience like that .
Person2:Oh , how were you saved finally ?
Person1: I was in such a panic at that time . Fortunately another boat came along and I was saved from drowning .
A:
informal