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 for you ?  
 Person2:I want to have a two-day trip around the city .  
 Person1:        Would you please have a look at the table ? I think this one fits you .  
 Person2:It's interesting . I think I will take the bus tour . By the way , what about the lodging ?  
 Person1:        We will lodge at the indigenes ' houses . It's interesting . 

formal