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:       I can't wait until my car is repaired . The commuting with public transportation is killing me .  
 Person2:It can't be that bad .  
 Person1:        But it is ! Take this morning for example . The subway was so packed this morning , I got totally squished by about a hundred busy commuters on the way to work .  
 Person2:At least the subway is better than the bus . It's faster for one thing . And usually less crowded . But the drawback is that the subway is more expensive than the bus . It adds up over time , if you take it every day .  
 Person1:        That's true . The bus is even worse . Just thinking about taking the bus every day makes me tired ! Hey , how do you get to work every day ?  
 Person2:I ride my bike . I don't live too far away , so it's pretty convenient . it's only about a ten minute bike ride from my house to the office .  
 Person1:        I'll bet it's good exercise , too ... a good way to keep fit .  
 Person2:Yes , not only a good way to keep in shape , but a good way to relieve stress as well . While you're stressed out by your commute , I'm releasing all the stress of the day with mine . 

informal