听力原文： Thank you for calling the City Convention Bureau's hotel hotline, providing out-

of-town visitors with local hotel information and a reservation service with participating hotels. We are sorry to inform. our callers that all hotels are full for the period from August 15 through August 30. We regret the inconvenience. If you would like to be put on a hotel waiting list, at the sound of the tone please leave your name, phone number, dates you plan to visit the city, and the number of people in your party. We will contact you if a room that fits your needs becomes available. Thank you.

What does this message state？

A．That there is a convention in town.

B．That city hotel rooms are all booked.

C．That hotels have closed.

D．That there are long lines for tourist attractions.