You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I planned to meet my friend in DCA, can you please help me to book a flight ticket from DFW?

ASSISTANT: Sure, let me know your trip dates please?

USER: I prefer to travel on Jun 19 and Jun 21.

ASSISTANT: May I know your connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you need any other preference?

USER: I would like to depart in afternoon.

ASSISTANT: Can I know your name please?

USER: I am Jennifer Miller.

ASSISTANT: Sorry, there is no flight available for your request.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.