You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I planned to attend for a meeting in EWR, can you please help me to book a flight ticket from DCA?

ASSISTANT: May I know your travel dates?

USER: I prefer to travel on Sep 15 and Sep 17.

ASSISTANT: Do you have any connection limit preference?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Could you help me with your name please?

USER: I am Donald Clark.

ASSISTANT: Sorry, there are no flights available for the given dates.

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

ASSISTANT: Thank you for reaching us.