You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I am Gary King. I am planning to book a ticket from CLT to DFW. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, let me know your budget for this booking.

USER: My fare should be below 500.

ASSISTANT: When are you planning to make your trip?

USER: I would like to travel on Oct 12 and return back on Oct 14.

ASSISTANT: Do you need a stopover within your route to DFW?

USER: I am ok with any connection.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you.

USER: That's fine, please proceed the booking.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.