You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please book a flight ticket from IAH to DCA?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: Thank you. I have planned my travel  dates as Jan 08 and Jan 10.

ASSISTANT: Do you need break in between your journey?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Please let me know if you have any other specifications.

USER: I would like to return in evening time so please make sure that.

ASSISTANT: Can I have your good name please?

USER: Sure, myself Sharon Lewis.

ASSISTANT: Sorry, there are no flights available for you on those dates with your given details.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

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

USER: Most welcome.