You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Barbara Hall. Can you please help me in booking a flight ticket to DCA from ATL?

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

USER: My travel dates are from Jan 17 to Jan 19.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight in between my journey.

ASSISTANT: Sorry, there is no flight services available on your required details.

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

ASSISTANT: Ok. Thank you for opting us.

USER: Thank you for the information.

ASSISTANT: Welcome.