You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I am Jason Young. Can you please help me in booking a flight ticket from IAH to DCA?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: The departure and arrival dates are 01/30 and 02/01.

ASSISTANT: Ok Jason Young, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Jason Young, no flight is available to you on your dates.

USER: It's ok, not a problem with that. I will reach some other travel agency to book the ticket. Thank you.

ASSISTANT: Thank you for choosing us, have a good day.