You will be given a definition of a task first, then some input of the task.
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: Have you bought a lot of new clothes for your vacation ?
Person2:No , I haven't . I've decided I ' m going to travel very light this time .
Person1: What does travel light mean ?
Person2:Oh ! It means that I'm going to take only a few clothes , so I didn't have to carry a heavy suitcase .
Output:
formal