You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I need to book my ticket from Washington. Could you please help me with booking a flight ticket from DCA to DFW?

ASSISTANT: Sure, can you please share your travel dates?

USER: My planned travel dates are from 14 to 16th April.

ASSISTANT: May I know your connection limit?

USER: Sure, I need a connecting flight in my journey.

ASSISTANT: Do you have any other specification that you are looking for?

USER: No, thank's for asking.

ASSISTANT: May I know your name to proceed further?

USER: Sure, myself Andrew Robinson.

ASSISTANT: Andrew Robinson, I am sorry to inform you that there is no flight available at your request.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for contacting us.