You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Ronald Moore. I need to book a ticket to attend a science cultural fest  in my school, Could you please help me in doing that?

ASSISTANT: Sure, may I know your travelling dates, please?

USER: Sure, my travelling dates are 08/09 and return on 08/11.

ASSISTANT: Let me know your airport codes, please?

USER: Sure , my airport codes are LAS to DCA.

ASSISTANT: Please wait a moment, I will check and get back to you.

USER: Make sure that the price should be below 1000. Sure.

ASSISTANT: Thanks for waiting, unfortunately there is no flight on your details.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your service.

ASSISTANT: Have a good day.