inform((_:search,destination,'stansted airport');(_:search,type,'Train'))
user
I need to find a train to take me to stansted airport .   Can you help me ?
inform((_:result,amount,'many');(_:result,destination,'Stansted Airport');(_:result,type,'Train')) request((_:search,arrive_by,?);(_:search,leave_at,?);(_:search,type,'Train'))
system
I have many trains going to Stansted Airport .   What is your preferred departure and arrival time ?
inform((_:search,arrive_by,'21:30');(_:search,day,'tuesday');(_:search,departure,'cambridge');(_:search,type,'Train'))
user
the train should leave Cambridge on Tuesday and arrive by 21:30
inform((_:result,arrive_by,'10:08');(_:result,day,'Tuesday');(_:result,departure,'cambridge');(_:result,destination,'stansted airport');(_:result,id,'TR8261');(_:result,leave_at,'9:40');(_:result,type,'Train')) offer((_:booking,category,'Train');(_:booking,type,'Booking'))
system
TR8261 leaves cambridge Tuesday at 9:40 and arrives at stansted airport by 10:08 . Would you like to buy a ticket ?
inform((_:search,people,'3');(_:search,type,'Train')) request((_:result,ref,?);(_:result,type,'Train'))
user
Yes I 'd like to book for 3 and get the reference number if I could .
system
Booking was successful , the total fee is 30.29 GBP payable at the station . Reference number is TXK6U7DG .
_:search destination stansted airport
_:search type Train
_:search destination stansted airport
_:result amount many
_:result destination Stansted Airport
_:result type Train
_:search leave_at ?
_:search arrive_by 21:30
_:search day tuesday
_:search departure cambridge
_:search type Train
_:search destination stansted airport
_:result amount many
_:search leave_at ?
_:search arrive_by 21:30
_:search day tuesday
_:search departure cambridge
_:result arrive_by 10:08
_:result day Tuesday
_:result departure cambridge
_:result destination stansted airport
_:result id TR8261
_:result leave_at 9:40
_:result type Train
_:system offered _:booking
_:booking category Train
_:booking type Booking
_:search people 3
_:search type Train
_:result ref ?