Can you help me find a train departing from birmingham new street going to cambridge?
Absolutely. What day do you need to get to Cambridge, and at what time?
train should arrive by 21:00 and should leave on tuesday
There are trains that meet those requirements leaving once an hour starting at 05:40.
Can you assist me with booking one?
Lets narrow down the time a little, the TR 3802 leaves at 17.40 and arrives at 20.23 so that gives you a little extra time, would you like me to book you?
That would be great. I also would like to book a guesthouse for my stay.  
Okay, great. You have a lot of options. Would you like to narrow it down by area, price range, or stars?
Yes. It should have 2 stars and include free wifi.
I do not have any in that star range. Shall I try something else?
Maybe a star rating of 3 would be good.  Is there anything available?
yes when were you planning your stay and for how many people?
I need the reservation to be for 2 people and 2 nights please. 
Okay! Starting when?
On Tuesday please. 
I've booked your room for two at Hamilton Lodge. You'll be staying for 2 nights beginning Tuesday. Your reference number is 3NT2B4SP. Can I help you find anything else today?
Thanks, that is all I'll need today.  Bye.
You're welcome, have a great day!