i need to leave cambridge on sunday by train .
user
the first train to leave cambridge departs at 5:00 , and goes to london kings cross .
assistant
that will be fine i guess . it will arrive by 19:15 , i am sure ?
user
tr2045 will arrive closer to that time , it arrives at 18:58 . would you like tickets for that 1 instead ?
assistant
yes , let s go ahead and book that .
user
my apologies , i believe there was an error in the database lookup . tr2045 is not available but tr3353 arrives at 17:51 on sunday . shall we book that instead ?
assistant
yes , please give me travel time and departure time , please .
user
certainly . the departure time is 17:00 and the travel time is 51 minutes . i have booked your ticket . the reference number is bjj3gxmx . can i help with anything else ?
assistant
no , that s all i need , thank you .
user
thank you for using our system !
assistant
thanks for your help bye !