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: Excuse me , where is the Beijing Railway Station ?
Person2:You can take the subway to get there .
Person1: How long will it take to get there ?
Person2:It takes only ten minutes .
Person1: May I take a bus or a taxi to get there ?
Person2:You can take No . I bus or a taxi .
Person1: Excuse me , sir . Where is the No . 1 bus stop ?
Person2:Please turn right at the traffic lights .
Person1: Thank you very much .
Output:
informal