You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in booking a flight ticket from DEN to DCA?

ASSISTANT: Sure, can you please let me know your trip dates?

USER: I want to travel on 08/11, and return on 08/13.

ASSISTANT: Do you have any connection limit preference?

USER: I need a break in my journey.

ASSISTANT: Do you have any other specifications?

USER: I want to return in evening time.

ASSISTANT: Could you help me with your name please?

USER: I am Alexander Lewis.

ASSISTANT: Sorry, there is no flight available for the mentioned dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.