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:       Hello . May I help you ?  
 Person2:Hi . Last month , our company , Turner Interiors of Beijing , ordered some documents under our new L / C . What I want to do is check and see if the documents have arrived yet .  
 Person1:        Let me find that on my screen ... yes , the L / C is right here . I'm sorry ; the documents don't seem to be here yet .  
 Person2:Oh , dear . When do you think they will arrive ?  
 Person1:        It should be around 5 working days , but different cases take different times . Sorry I can't be more precise . 

formal