inform((_:search,arrive_by,'09:15');(_:search,day,'thursday');(_:search,type,'Train'))
user
i am looking for a train that leaves on thursday and arrives by 09:15
request((_:search,departure,?);(_:search,type,'Train'))
system
Where are you departing from , please ?
inform((_:search,departure,'cambridge');(_:search,type,'Train'))
user
I am leaving from Cambridge where I am now .
request((_:search,destination,?);(_:search,type,'Train'))
system
What is your destination ?
inform((_:search,destination,'london liverpool street');(_:search,type,'Train'))
user
I 'm going to london liverpool street .
inform((_:booking,category,'Train');(_:booking,ref,'XFCGPXHA');(_:booking,ticket,'23.6 GBP');(_:booking,type,'Booking'))
system
Booking was successful , the total fee is 23.6 GBP payable at the station . 
 Reference number is : XFCGPXHA .
bye()
user
Thank you , that 's all I need . good bye .
system
Thank you for using the Cambridge TownInfo centre . Have a nice day !
_:search arrive_by 09:15
_:search day thursday
_:search type Train
_:search arrive_by 09:15
_:search day thursday
_:search departure cambridge
_:search type Train
_:search arrive_by 09:15
_:search day thursday
_:search departure cambridge
_:search destination london liverpool street
_:search type Train
_:search arrive_by 09:15
_:search day thursday
_:search departure cambridge
_:search destination london liverpool street
_:search type Train
_:booking category Train
_:booking ref XFCGPXHA
_:booking ticket 23.6 GBP
_:booking type Booking
_:user dismissed _:system