inform((_:search,day,'saturday');(_:search,destination,'cambridge');(_:search,type,'Train'))
user
I need a train to cambridge that leaves on saturday .
request((_:search,departure,?);(_:search,type,'Train'))
system
I need to narrow this down a bit .   Where will you be departing from ?
inform((_:search,arrive_by,'10:30');(_:search,departure,'london liverpool street');(_:search,type,'Train'))
user
I will be departing from London Liverpool Street and need to arrive by 10:30 .
inform((_:result,arrive_by,'09:07');(_:result,id,'TR2503');(_:result,type,'Train')) reqmore()
system
TR2503 can get you there by 09:07 , can I help with anything else ?
request((_:result,ticket,?);(_:result,type,'Train'))
user
What is the price ?
inform((_:result,ticket,'13.28 pounds');(_:result,type,'Train')) offer((_:booking,category,'Train');(_:booking,type,'Booking'))
system
13.28 pounds . Do you need me to book it ?
request((_:result,leave_at,?);(_:result,type,'Train'))
user
What 's the departure time for that train ?
inform((_:result,leave_at,'05:39');(_:result,leave_at,'07:39');(_:result,leave_at,'23:39');(_:result,type,'Train'))
system
05:39 , 07:39 , and 23:39
inform((_:search,area,'centre');(_:search,food,'mediterranean');(_:search,type,'Restaurant'))
user
I am also looking for mediterranean   food in the centre .
system
I can recommend la mimosa , it is in the expensive range .
_:search day saturday
_:search destination cambridge
_:search type Train
_:search day saturday
_:search destination cambridge
_:search arrive_by 10:30
_:search departure london liverpool street
_:search type Train
_:search day saturday
_:search destination cambridge
_:search arrive_by 10:30
_:search departure london liverpool street
_:search type Train
_:result arrive_by 09:07
_:result id TR2503
_:result type Train
_:system inquired _:user
_:result ticket ?
_:search day saturday
_:search destination cambridge
_:search arrive_by 10:30
_:search departure london liverpool street
_:search type Train
_:result arrive_by 09:07
_:result id TR2503
_:system inquired _:user
_:result ticket 13.28 pounds
_:result type Train
_:system offered _:booking
_:booking category Train
_:booking type Booking
_:result leave_at ?
_:search day saturday
_:search destination cambridge
_:search arrive_by 10:30
_:search departure london liverpool street
_:result arrive_by 09:07
_:result id TR2503
_:system inquired _:user
_:result ticket 13.28 pounds
_:system offered _:booking
_:booking category Train
_:booking type Booking
_:result leave_at 05:39
_:result leave_at 07:39
_:result leave_at 23:39
_:result type Train
_:search area centre
_:search food mediterranean
_:search type Restaurant