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:       Did you get my email ?  
 Person2:I certainly did . Do you want to come in and give me some feedback about your weekend ?  
 Person1:        Sure .  
 Person2:How did the business trip go ?  
 Person1:        Well , to be honest , nothing is more stressful than going on a business trip with our boss .  
 Person2:I understand . The last time I went on a business trip with the boss , I didn't even have enough to eat !  
 Person1:        I also think the company is pretty cheap with travel expenses . I spent half of the weekend on a train ! Surely they could have afforded to buy a few plane tickets !  
 Person2:Our company is quite conscious of the environmental problems that frequent flying causes .  
 Person1:        I see . Well , then perhaps they could give me a few days off after a business trip . It was really tiring for me .  
 Person2:I can ask the boss about giving you the day off today .  
 Person1:        Thank you . I can't imagine getting much done today . I'm just too exhausted !  
 Person2:No problem . Did you bring any gifts back for your department ?  
 Person1:        No , should I have ? 

informal