You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Christine Wilson here. Could you book my ticket from DCA for a round trip?

ASSISTANT: Sure, can you please tell me your travel dates?

USER: My trip dates are 02/22 and 02/24.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: There is a flight available with Hawaiian airlines and the ticket fare is 100 only. Is that ok for you?

USER: Please book my ticket.

ASSISTANT: Your ticket is booked and your flight number is 1000.

USER: Thank you.

ASSISTANT: You are welcome.