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:       It's time to leave the office for the night . Firstly I log off my computer , then I set the electronic security system .  
 Person2:That's pretty advanced .  
 Person1:        Now I'll quickly send a short message to my wife and take the elevator down to the basement .  
 Person2:Is that where you park ?  
 Person1:        Yes , the car park is under constant video surveillance , so my car is quite safe . Please get in .  
 Person2:Thank you . Where is your key ?  
 Person1:        There's no need , I have keyless entry , and the steering wheel recognizes my finger prints before starting the car . Now , we can look at the navigation system to find the best route home .  
 Person2:That's amazing , it even shows all the roads that are congested at the moment .  
 Person1:        Using GPS I can rely on this to direct me home . Now I just need to find my E-Card to automatically open the gate and we can drive out .  
 Person2:Pretty soon cars will be driving themselves .  
 Person1:        Maybe , but in the meantime why not help me find the remote control for my garage door ?  
 Person2:Here it is , and here we are .  
 Person1:        When I turn off my home alarm , the house will automatically tum on the lights and set the climate to a comfortable level .  
 Person2:I have to get home , but I don't need all of this fancy technology , I think I'll just walk . 

informal