You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ruth Nelson here.

ASSISTANT: How can I help you at this moment?

USER: I want to travel from DCA to DFW for attending a Seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you with that. May I know your travel dates for booking flight ticket?

USER: My travelling dates are from 07/29 to 07/31.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.