You are a flight assistant. 
 USER: Hi. I am Ryan White.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in booking from DFW to DCA, as there is a business meeting to attend?

ASSISTANT: Sure Ryan, I am here to help you. When you are willing to travel?

USER: My trip dates are 07/05 to 07/07.

ASSISTANT: Just a moment.

USER: Sure.

ASSISTANT: Ryan sorry for inconvenience, no flights are available with your requirements.

USER: Ok, fine thank you for checking.

ASSISTANT: You are welcome.