i am looking for a train headed to cambridge .
user
when and where would you like to depart ?
assistant
i would like to depart from stevenage on wednesday .
user
is there a particular time you would like to leave or arrive by ?
assistant
i would like to arrive by 8:30 .
user
there is 1 options available tr9448 , leaves at 05:54 and arrives at 06:43 .
assistant
okay , could you tell me the price ?
user
the 5:54 train is 12.80 pounds .
assistant
can you book it for me and send me the reference number ?