You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I want to book a flight ticket from LAS to IAD. Could you help me in booking?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My traveling dates are from Dec 24 - 26.

ASSISTANT: Please mention your connection limit?

USER: I prefer for direct flight.

ASSISTANT: Is there any other requirement?

USER: No.

ASSISTANT: May I know your good name?

USER: Benjamin Hall.

ASSISTANT: Thank you for the details, sorry there is no flight found on your given journey dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for visiting us, we hope see you again.