You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Brandon Martinez, want to travel from DCA to DFW for my business meeting. Can you please help me?

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates to proceed further?

USER: My trip dates are from 02/12 to 02/14.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Brandon Martinez, there are no flight services available on this route on your provided dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for utilising our service.