U: I am trying to book a train.

S: What an excellent way to see the beautiful countryside. What other information can you give me?

U: I want to travel from Cambridge to London Liverpool Street on Thursday after 09:45.

S: I see that there are 8 trains available. What about TR2715 that leaves at 09:59?

U: I would like price, please

S: Certainly. Any ticket on that route is going to cost 16.60 pounds.

U: I'm also looking for a hotel to stay that has a star of 0 in the expensive price range.

S: There are no hotels in Cambridge that are expensive with a 0 star rating. Would you like to change either the price range or the star rating?

U: There's nothing in the north?

S: I do have City Centre North B and B in the north. It's in the cheap price range with 0 stars. Might that work for you?

U: Yeah, I think that would be all right.

S: Can I assist you with making a reservation there?

U: Yes please for 8 people, 5 nights starting Saturday.

S: unfortunately this b&b is booked for those dates, is there another day or shorter time that would work? Or should we search another area?

U: Are there in hotels in the north with a 2 star rating?

S: There are no cheap hotels in that area with 2 stars.  Can I check for a guesthouse for you or would you like another area?

U: I would prefer you to check another area, please.

S: I can not find anything that meets that criteria. We can change the price range or the star rating and search again if you like?

U: Can you search for one that is cheap in price then?

S: Nothing is rated 2 stars in any part of the city, what specifically would you like?

U: I need something in the cheap price range with other restrictions retained.

S: No matching records for that. How about we change the star rating?

U: Are there any cheap 0 star hotels in the north?

S: Yes, there is city centre north b and b, would you like me to book you?

U: Is there a lot of noise from traffic and other rooms in this hotel?
S: It's unclear, some guests say the rooms are very quiet, others say that disruptive noises come from outside their rooms. Would you like me to book you?