You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me with flight ticket booking to LAS from my location DCA to attend a musical concert?

ASSISTANT: Ok, may I know your journey dates?

USER: Thank you for considering my request and my planned travel dates are Jan 27 and back on Jan 29.

ASSISTANT: Let me know your name to proceed further.

USER: My name is Gregory King.

ASSISTANT: Do you have any other preferences?

USER: I would like to depart in the afternoon time which is a single connected flight.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Sad to hear that one, thank you for your search and providing the information.

ASSISTANT: Thanks for contacting us.

USER: Welcome.