i am looking for a train to london liverpool street .
user
there are many trains that travel from cambridge to london liverpool street . what day and time would you like to travel ?
assistant
i would like to leave friday and arrive by 17:45 .
user
tr5212 departs from cambridge and arrives at london liverpool street . it leaves on friday 17:59 . would you like to book it ?
assistant
no , that 1 will not work . i have to arrive by 17:45 .
user
i have train tr9956 that departs at 15:59 and will get you there by 17:27 . would that work for you ?
assistant
yes , that would work . can you book me 4 tickets please ?
user
booking was successful , the total fee is 66.4 gbp payable at the station . reference number is : x5em7dtz . is there anything else ?
assistant
would you like to make another reservation ?