You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist  you?

USER: I am Frank Brown. I need to book a flight ticket from IAD to DCA, Can you please help me for booking?

ASSISTANT: Sure, can I know your travel dates?

USER: I would like to travel on 01/07 to 01/09.

ASSISTANT: The flight 1009 of Spirit airlines is available on your requested dates. Shall I proceed?

USER: Ok, proceed for booking.

ASSISTANT: Frank, your reservation has been done successfully.

USER: Thanks for your information.

ASSISTANT: You are welcome.