Definition: 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 . 

informal