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:       Ok , I ’ Ve got an up-to-day map . Let ’ s check the route from here to the airport . 
 Person2:Where are we ? Oh , here we are . So we drive to the A120 and turn left . 
 Person1:        No , we turn right . Remember that we are coming from this direction . 
 Person2:Oh yes ! Sorry ! Then we drive to the M11 motorway . 
 Person1:        How far is that ? 
 Person2:It ’ s only seven miles . We turn left to join the motorway and drive south . 
 Person1:        According to the map , we get off the M11 at the second junction and join the M25 . That ’ s the motorway that goes around the edge of London . 
 Person2:That ’ s another 15 miles , so that ’ s 22 miles total so far . 
 Person1:        Then we drive west on the M25 . we must be careful to turn in the right direction ! 
 Person2:Then we drive on the M25 . it turns south . When we reach exit 15 , we turn left and go west along the M4 . 
 Person1:        Then we take the first Heathrow Airport . What ’ s the total distance ? 
 Person2:The journey around the M25 is 33 miles and then 3 extra miles to get to the airport . So how many miles is that together ? 
 Person1:        22 miles to the M25 , 33 miles on the M25 , and 3 after that . That ’ s a total of 58 miles , isn ’ t it ? 
 Person2:It shouldn ’ t take us very long to cover that distance . Remember that we can go quite fast on the motor way . 
 Person1:        We can only go fast on the motor ways if there isn ’ t much traffic . I think we should allow ourselves plenty of time to get there . Being early is much better than being late . 

informal