Task-oriented dialogue about: train

I need to find a train going to Stevenage. Can you help me?
What day will you travel?
We will be leaving on Tuesday and would like to arrive by 16:00.
How about a train that leaves at 17:21?
Thast will work,I need you to book it for 2 people and a reference number please
I want to confirm you are leaving from Cambridge. If you want to arrive in stevenage by 16:00, I recommend TR0743, leaving at 13:21 and arriving at 14:10.
Yes, can I have the reference number and also a place to stay with 3 stars and fee parking?
The reference number is 4H7V2X8R .