inform((_:search,day,'sunday');(_:search,departure,'bishops stortford');(_:search,type,'Train'))
user
am looking for a train it should leave on sunday and should depart from bishops stortford
request((_:search,destination,?);(_:search,type,'Train'))
system
Thank you . Where is your destination ?
inform((_:search,destination,'cambridge');(_:search,type,'Train'))
user
I 'm going to Cambridge .
request((_:search,arrive_by,?);(_:search,leave_at,?);(_:search,type,'Train'))
system
What time are you looking to depart / arrive ?
inform((_:search,leave_at,'18:30');(_:search,type,'Train'))
user
I want to depart after 18:30 .
inform((_:result,arrive_by,'20:07');(_:result,id,'TR0053');(_:result,leave_at,'19:29');(_:result,type,'Train')) offer((_:booking,category,'Train');(_:booking,type,'Booking')) request((_:search,arrive_by,?);(_:search,day,?);(_:search,departure,?);(_:search,destination,?);(_:search,leave_at,?);(_:search,people,?);(_:search,type,'Train'))
system
TR0053 leaves at 19:29 and arrives at 20:07 . Do you want me to book this train ? I will need your details , please .
inform((_:search,people,'1');(_:search,type,'Train')) request((_:result,ref,?);(_:result,type,'Train'))
user
Yes , I need 1 ticket and can you please give me the reference number ?
inform((_:booking,category,'Train');(_:booking,ref,'6W3KFY5N');(_:booking,ticket,'8.08 GBP payable at the station');(_:booking,type,'Booking'))
system
Booking was successful , the total fee is 8.08 GBP payable at the station . 
 Reference number is : 6W3KFY5N .
thank()
user
Thanks ever so much ! You 've been very helpful .
system
You are very welcome ! Have a nice trip .
_:search day sunday
_:search departure bishops stortford
_:search type Train
_:search day sunday
_:search departure bishops stortford
_:search destination cambridge
_:search type Train
_:search day sunday
_:search departure bishops stortford
_:search destination cambridge
_:search arrive_by ?
_:search leave_at 18:30
_:search type Train
_:result arrive_by 20:07
_:result id TR0053
_:result leave_at 19:29
_:result type Train
_:system offered _:booking
_:booking category Train
_:booking type Booking
_:search arrive_by ?
_:search day ?
_:search departure ?
_:search destination ?
_:search leave_at ?
_:search people 1
_:search type Train
_:result ref ?
_:result arrive_by 20:07
_:result id TR0053
_:result leave_at 19:29
_:result type Train
_:system offered _:booking
_:search arrive_by ?
_:search day ?
_:search departure ?
_:search destination ?
_:search leave_at ?
_:search people 1
_:search type Train
_:result ref ?
_:booking category Train
_:booking ref 6W3KFY5N
_:booking ticket 8.08 GBP payable at the station
_:booking type Booking