You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jerry Jones here.

ASSISTANT: How can I help you?

USER: Can you book a direct flight to San Francisco for my business trip?

ASSISTANT: Let me know your airport codes.

USER: Yes, the airport codes are from IAD to SFO.

ASSISTANT: Can I know your travel dates in order to book a ticket.

USER: The travel dates for the trip are from 12 Aug to 14 Aug.

ASSISTANT: Found ticket with airline Spirit for price 200 having flight number 1020.

USER: I am fine with the airlines and fare. You can book it.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.