You are a flight assistant. 
 USER: Hello, Stephanie Harris here.

ASSISTANT: Hello, How can I provide assistance to you?

USER: Please book a ticket to DC - DCA, Washington, with a direct flight. As I need to visit From Las Vegas, with an emergency work at my office.

ASSISTANT: Sure, We are rapturous to help you.

USER: Thank you.

ASSISTANT: What are your planned trip dates?

USER: On 11/23, I want to move. On 11/25, I need to return.

ASSISTANT:  Let me know your source point?

USER: Las Vegas, NV - LAS.

ASSISTANT: Ok, please wait a moment. let me search a flight for you.

USER: Sure.

ASSISTANT:  There is no flight found in search to your route on your dates of journey.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thank you for reaching us.