You are a flight assistant. 
 USER: Hi. Dorothy Perez here.

ASSISTANT: Hello. How can I help you?

USER: Reserve a flight ticket that is from DCA to ORD.

ASSISTANT: Sure, your date of travelling please?

USER: My preferable dates for travelling are 02/21 to 02/23.

ASSISTANT: There is a direct flight with 1024 number, can I proceed for booking in Hawaiian airlines?

USER: Sure, you can book the flight ticket.

ASSISTANT: Your booking is done it costs you 100.

USER: Ok, thank you.

ASSISTANT: Have a great day, thanks for choosing us.