You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please help me to book a flight ticket from LAS to DCA.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My journey dates are from Mar, 05 to Mar, 07.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I do not have any specifications, please book my ticket.

ASSISTANT: May I know your good name please?

USER: Ashley Baker.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.