You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Sandra Young. I need to schedule my trip to travel to visit Atlanta this month. Can you please help me in booking the ticket from IAD to ATL?

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

USER: I am willing to travel on 09/18 and again I will return back on 09/20.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I will wait for your response.

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

USER: Not a big problem, anyhow thank you very much for your information.

ASSISTANT: Thank you for approaching us.