You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Please book a flight ticket from IAD to SFO.

ASSISTANT: Can you share your travel dates?

USER: My trip dates are 02/17 and 02/19.

ASSISTANT: Do you need any connections?

USER: Yes, I need a connecting flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: Ronald Clark here.

ASSISTANT: Connecting flight number 1009 with price 900 in business class is available. Is it ok?

USER: Yes, it is ok.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.