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: I have been very busy this year , working late , often taking work home and taking no vacation . I feel exhausted .
Person2:You should ask for a holiday and relax yourself for a little bit . You worked so hard .
Person1: You are right . For the past few weeks , I had no appetite and couldn ' t sleep well . What ' s worse my back started aching this Monday . It is time for me to take a vacation .
Output:
informal