You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Richard Clark this side, can you book a ticket from DCA to LAS?

ASSISTANT: Please provide your travel dates.

USER: Sure, my trip dates are 12/17 and 12/19.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure, take your time.

ASSISTANT: Delta airlines with flight 1002 is available.

USER: Please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.