At the arrival to the hotel, a guest asks some questions to a hotel receptionist. Read the dialogue and answer the question.

Guest: Will you please help me? I want to know about breakfast time.

Receptionist: Sure, please feel free to ask anything you like.

Guest: We are very tired after a long flight. Can you tell us the time for breakfast?

Receptionist: Oh! You must be hungry. You may have your breakfast until 10 o’clock.

Guest: Thanks, that’s great.

What does the modal “must” stand for in receptionist’s respond to the guest?