You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need to attend for a client meting in SFO. Can you please book a flight from IAD?

ASSISTANT: Sure, can you please mention with your dates of journey?

USER: Sure, I want to depart on June 17 and intend to return on June 19.

ASSISTANT: May I know your name please?

USER: Rebecca Moore here.

ASSISTANT: Do you have any other requirements please?

USER: I need a connecting flight with an business class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Moore, there is no flight found as per your travelling details.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: You are welcome.