i need a train from cambridge to ely .
user
no problem . what day will you be leaving , and is there a particular time you would like to board ?
assistant
yes , i need to leave on friday sometime after 15:30 .
user
i have a train that leaves cambridge at 15:50 and arrives in ely at 16:07 , would you like me to book it for you ?
assistant
yes , i also would like the reference number .
user
sure thing . the number is fac22hsg . anything else i can do for you ?
assistant
i am sorry , i forgot to specify that i need 6 tickets . could you change that for me ?
user
surely , i have made that change and the new reference number is ywf1k74n . is there anything else i can do for you ?
assistant
thanks i appreciate it . that s all i need !