inform((_:search,departure,'birmingham new street');(_:search,destination,'cambridge');(_:search,type,'Train'))
user
I need a train to Cambridge . I am currently at Birmingham New Street .
request((_:search,day,?);(_:search,type,'Train'))
system
Sure , when do you want to leave ?
inform((_:search,arrive_by,'14:00');(_:search,day,'tuesday');(_:search,type,'Train'))
user
Tuesday , I 'd like to arrive by 14:00 , please .
inform((_:result,arrive_by,'13:23');(_:result,day,'Tuesday');(_:result,destination,'Cambridge');(_:result,id,'TR4931');(_:result,leave_at,'10:40');(_:result,type,'Train')) offer((_:booking,category,'Train');(_:booking,type,'Booking'))
system
Train TR4931 leaves Tuesday at 10:40 and arrives by 13:23 in Cambridge . Would you like to book this train ?
inform((_:search,people,'3');(_:search,type,'Train'))
user
Yes , I would like to book for 3 people .
inform((_:booking,category,'Train');(_:booking,ref,'8S88SBMF');(_:booking,ticket,'225.3 GBP');(_:booking,type,'Booking'))
system
Booking was successful , the total fee is 225.3 GBP payable at the station . 
 Reference number is : 8S88SBMF .
thank() inform((_:search,category,'guesthouse');(_:search,type,'Hotel'))
user
Great ! Thanks so much ! Can you also help me find a guesthouse ?
system
Sure i will find you one and inform you as soon as possible
_:search departure birmingham new street
_:search destination cambridge
_:search type Train
_:search departure birmingham new street
_:search destination cambridge
_:search arrive_by 14:00
_:search day tuesday
_:search type Train
_:search departure birmingham new street
_:search destination cambridge
_:search arrive_by 14:00
_:search day tuesday
_:result arrive_by 13:23
_:result day Tuesday
_:result destination Cambridge
_:result id TR4931
_:result leave_at 10:40
_:result type Train
_:system offered _:booking
_:booking category Train
_:booking type Booking
_:search people 3
_:search type Train
_:search departure birmingham new street
_:search destination cambridge
_:search arrive_by 14:00
_:search day tuesday
_:result arrive_by 13:23
_:result day Tuesday
_:result destination Cambridge
_:result id TR4931
_:result leave_at 10:40
_:result type Train
_:system offered _:booking
_:search people 3
_:booking category Train
_:booking ref 8S88SBMF
_:booking ticket 225.3 GBP
_:booking type Booking
_:search category guesthouse
_:search type Hotel