You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Lewis.

ASSISTANT: How may I help you?

USER: I want to visit IAD in my holidays, can you please help in booking my flight from ATL?

ASSISTANT: Could you please share your trip dates?

USER: Sure, my travel dates are June 21st and June 23rd.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Can you please share your required timings?

USER: I should return in the afternoon time only.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Anyways, thanks for the information.