You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sandra Collins.

ASSISTANT: How can I aid you today?

USER: I am planning to attend music concert at DFW, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Sure Sandra Collins, I an ready to help you with that. Can I have your travel dates please?

USER: My trip dates are Mar 25 to Mar 27.

ASSISTANT: Do you have any specifications regarding timings of your journey?

USER: I need a connecting flight which return in afternoon.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Sandra Collins, no flight is available to you on your dates.

USER: No issue, thank you.

ASSISTANT: Thank you for choosing us, have a good day.