I'm looking for a guesthouse to stay in. I don't care about parking, though.
There are 24 places available, Acorn Guest House has good ratings
I ant a place with a rating of at least 4 stars, a guesthouse, in the east, and I don't need free parking.
Okay, how about the a and b guest house?  If fits everything you need.
Perfect! Let's book it for two nights starting Saturday. There are five people in my party. I will also need the reference number.
Sorry, that booking is unavailable. Perhaps another day or a shorter stay would work for you?
Can you suggest another place, is there a hotel with 4 stars in that area? 
I'm sorry but there are no 4 star hotels in the east, but there are quite a few 4 star guesthouses. Would one of those interest you? 
Yes. I want to book one for 5 people and 2 nights starting from saturday.
Actually the A & B Guesthouse just opened up for Saturday.  Your reference number is GM77DLR6.  Can I further assist you?
That's it for now, thank you so much.
You're welcome, Thank you, goodbye.