Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. If the conversation begins with a question, label it '1' otherwise '0'.
Input:  Person1:     David , what have you been up to lately ?  
 Person2:  I went on a trip with my family last week .  
 Person1:      Really ? Where did you go ?  
 Person2:  We went to Europe .  
 Person1:      What cities did you go to ?  
 Person2:  London , Paris and a few other cities .  
 Person1:      Did you go to Berlin ?  
 Person2:  No , We didn't go there . I'd like to go there next time .  
 Person1:      I think this summer is a good time to visit Berlin . It's a beautiful place and the people there are very nice .  
 Person2:  That's what I've heard .  
 Person1:      I went there last year . If you want , I can give you some information I have about the city .  
 Person2:  Thanks . 

1