You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: Mark Adams here. I'm planning to visit Dallas, can you please book a ticket from DCA to DFW?

ASSISTANT: Sure, we are ecstatic to help you. May I know on which dates you are willing to travel?

USER: Sure, my planned departure and return travel dates are 2nd and 4th of July.

ASSISTANT: Is there any restrictions in ticket fare?

USER: Yes, I can afford upto 500 for my ticket.

ASSISTANT: As per your information, we found a direct flight with a fare of 200 in 1019 Spirit airline. Shall I proceed?

USER: That's fine, you can proceed for booking the ticket.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you so much for your help in booking the ticket.

ASSISTANT: Thank you for choosing us.