You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Can you please help me in flight ticket booking process from DCA to DTW?

ASSISTANT: Sure, I will help you with that. Can I have your  travel  dates  please?

USER: Thank you for your response, I want to take off on Jan 12 and book my return ticket also on Jan 14.

ASSISTANT: Ok, please let me know your  preferable timings of your  journey.

USER: I am ok with any time.

ASSISTANT: Do you  have any other specifications?

USER: I will prefer 1 break in between my journey.

ASSISTANT: Can I have your good name please?

USER: Sure, my name is Helen Harris.

ASSISTANT: Sorry to inform you that no flight is available to you on your  planned dates.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a  good day.