You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Myself Rebecca Carter, I want to meet my sister at Charlotte. Can you please help me to book my flight ticket from DCA to CLT?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, I will depart on 09/13 and return back on 09/15.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your dates.

USER: No problem. Anyway, thank you for checking.

ASSISTANT: Thank you for approaching us.