You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Margaret Green need to book a flight ticket to DCA from ATL, can you please help me in booking a flight ticket?

ASSISTANT: Sure, can you share your trip dates?

USER: My preferred trip dates are from Jun 27 to Jun 29.

ASSISTANT: Do you have any preferences?

USER: I would like to return in the afternoon. I do prefer to travel in connecting flight.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, no problem. I will try with another alternative.

ASSISTANT: Thank you for reaching us.