You are a flight assistant. 
 USER: Hello, my name is Ronald Gonzalez.

ASSISTANT: Hello. How may I help you today?

USER: I want to head from Washington to attend a live concert at Dallas & Fort Worth. Can you help me book a direct flight?

ASSISTANT: Sure, can I know your planned travelling dates to proceed further?

USER: My journey is from DCA to DFW.

ASSISTANT: Is there any budget limit?

USER: It should be within 1000.

ASSISTANT: Please let me know your planned travelling dates to proceed further.

USER: They are planned to be on 02/19 and 02/21.

ASSISTANT: Give me a moment i will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: It's ok, thank you.

ASSISTANT: You're welcome. Happy journey.