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:       Is there anything I can do ?  
 Person2:Yes . I am thinking of a tour to Australia .  
 Person1:        May I recommend the popular route ? It's a seven days ' trip and cost $ 500 .  
 Person2:That's really cheap . What are the fees included ?  
 Person1:        Everything , sir , including the air tickets , accommodation and gate tickets .  
 Person2:OK , I will take the tour . 

formal