You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I am Timothy Jackson. I want to book a flight ticket to visit National Mall in Washington DC - IAD, so please help me in booking a flight ticket from Las Vegas NV - LAS.

ASSISTANT: Sure, we are here to help you. May I know your journey dates?

USER: I want to fly on 01/07 and return on 01/09.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a direct flight.

ASSISTANT: No flights found on your journey dates.

USER: Not an issue.

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

USER: Thank you for your information.