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 had a terrible journey back from Bangkok last week .  
 Person2:Really ? Why ? What happened ?  
 Person1:        Well , first of all , the taxi that was taking me from the client's office to the airport broke down on the freeway .  
 Person2:Oh , no .  
 Person1:        Yes , and the driver didn't speak any English or Chinese and he didn't have a phone on him-can you believe it ? - and his radio didn't work . So there was no way he could get in touch with the office to get them to send another taxi .  
 Person2:So what did you do ?  
 Person1:        Well , I actually thumbed a lift .  
 Person2:You what ?  
 Person1:        Yes , I stood on the side of the freeway and stuck my thumb out , and a passing truck stopped and took me to the airport .  
 Person2:Wow , good for you .  
 Person1:        Yes , except he drove really slowly , and I missed my flight .  
 Person2:Oh , no !  
 Person1:        Yes , so I had to wait three hours for the next one . I didn't get home till four in the morning , and when I got home I realized I'd left my house keys in my hotel in Bangkok .  
 Person2:You really have bad luck , don't you ?  
 Person1:        Seems like it . 

informal