You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Please book a ticket to Dallas & Fort Worth, TX-DFW from Washington DC-IAD. I'm Dorothy Baker.

ASSISTANT: Sure, can you please let me know your price limit?

USER: Ticket price limit is 5000. Please provide direct flight.

ASSISTANT: May I know on which dates would you like to travel?

USER: Depart will be on 11/22 and return date is 11/24.

ASSISTANT: Thank you for providing all necessary details, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Thanks.

ASSISTANT: Thank you for reaching us. Have a good day.