Choose the best answer to fill in the bl…

Choose the best answer to fill in the blank.

Receptionist: Good afternoon, City Library. How may I help you?

Caller: Hi. I'd like to speak to someone about booking the lecture room for next Friday.

Receptionist: Certainly. ___

Caller: Thank you.

Officer: Hello, events office, Mary speaking. I hear you'd like to book the lecture room?

Caller: Yes, for about forty people, from two to five in the afternoon.

Officer: Let me check. Yes, it's free then.