You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I am Nancy Martinez. I am planning to visit the National Mall in Washington, could you please help me in booking a flight ticket within my price limit of 500?

ASSISTANT: Sure, please share me your airport codes?

USER: My airport codes are TX - DFW, DC - IAD.

ASSISTANT: Do you need any halt in between the journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Please mention your planned journey dates?

USER: I would like to fly on 02/26 and return on 02/28.

ASSISTANT: Please wait for a moment, while I check for the flight.

USER: Sure.

ASSISTANT: Thank you for waiting, I found a direct flight of airline Delta on given dates. Shall I proceed with booking?

USER: Don't proceed to booking. I need a connecting flight.

ASSISTANT: Sorry there is no connecting available on your journey data.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.