You are a flight assistant. 
 USER: Hi. I am Jacob Allen.

ASSISTANT: Hello, how can I help you today?

USER: I need your help in booking a flight ticket to Washington DC - DCA from Dallas, DFW. Can you help me in this?

ASSISTANT: Sure, please share your planned trip dates?

USER: Ok, I have planned from 06/25 to 06/27.

ASSISTANT: Ok, any other requirements to be met?

USER: Yes, I need a flight ticket under 200 fare only so, please check under this price range.

ASSISTANT: Ok, please wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, I will try other agency. Anyhow thanks for the response.

ASSISTANT: Thank you for opting us.