inform((_:search,day,'saturday');(_:search,destination,'cambridge');(_:search,type,'Train'))
user
I am looking for a train to Cambridge on Saturday .
request((_:search,departure,?);(_:search,leave_at,?);(_:search,type,'Train'))
system
certainly , do you know from where you will be departing , and at what time ?
inform((_:search,arrive_by,'11:30');(_:search,departure,'birmingham new street');(_:search,type,'Train'))
user
I will depart at Birmingham New Street and should arrive by 11:30 . Can you help me with this ?
system
Of course I can . There are 6 possibilities , at what time would you like to leave ?
_:search day saturday
_:search destination cambridge
_:search type Train
_:search day saturday
_:search destination cambridge
_:search leave_at ?
_:search arrive_by 11:30
_:search departure birmingham new street
_:search type Train