You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you?

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

ASSISTANT: Can you please provide your preferable dates of travelling?

USER: My trip dates are 03/21 and 03/23.

ASSISTANT: May I know your name to proceed further?

USER: James Lee here.

ASSISTANT: Do you need any connections between your trip?

USER: I am comfortable to travel with a single connecting flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: As per your requirements there is a American airlines, flight number:1007 is going on your way with single connection and price:200. Is that Ok for you?

USER: Yes, it is ok.

ASSISTANT: Your ticket has been booked successfully.

USER: Thank you.

ASSISTANT: Thank you for opting us.