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:       Excuse me . Do you think I can get there in time to catch the 11:30 train ?  
 Person2:Well , let me see . Now it's 11:00 sharp . It's a long way to go.If I take the shortest route , we may come across a traffic jam.If I take a less heavy route , it will save us 10 or more minutes , but you'll have to pay more . Which do you prefer ?  
 Person1:        Are you sure that I can get there in time if we take the less heavy route ?  
 Person2:Generally speaking , we can if we go at this speed and nothing unexpected happens .  
 Person1:        How much more do I have to pay ?  
 Person2:Compared to the shortest route , you may pay around 5 Euro more .  
 Person1:        That's acceptable . No one wants to miss a train .  
 Person2:OK ... Here we are . We'll turn left at this cross . To go straight ahead is the shortest route .  
 Person1:        Thank you ! 

informal