Represent the dialog for retrieving similar scenarios Speaker2: Which ticket should I buy?
Speaker1: Hm, for two days it's pointless to get an Oyster
Speaker3: Buy a travelcard
Speaker2: Geez, this city is expensive :/
Represent the dialog scenario for retrieval Speaker3 thinks Speaker2 should buy a travelcard. 
Represent the dialog scenario for retrieval Speaker1 hasn't taken the trash out because parents didn't ask him. Speaker2 will do it.