You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Laura Lee.

ASSISTANT: How can I help you today?

USER: I would like to visit Boston to meet my college friends, please help me in booking a ticket from DCA to BOS.

ASSISTANT: Sure, please mention your trip dates to proceed further.

USER: My planned trip dates are 01/25 and 01/27.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Lee, there is no flight available on your route.

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

ASSISTANT: You are welcome, have a nice day.