You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi.

USER: I am Cynthia Harris.

ASSISTANT: Yes, how can I help you?

USER: I would like to book a ticket from BOS to DCA, could you help me in that?

ASSISTANT: Can I have the dates please?

USER: Sure, my preferable dates are 02/25 and return on 02/27. And please make sure that fare may not increase 1000 and connection limit should be 1.

ASSISTANT: Sorry, no flight available regarding your journey. Thank you and have a great day.