You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in booking my flight ticket from ATL to DCA?

ASSISTANT: Can you share your trip dates?

USER: My trip dates will be Aug 17th to Aug 19th.

ASSISTANT: Do you need any connections?

USER: I prefer a direct flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: I am William Collins.

ASSISTANT: Sorry, there is no flight found with your details.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.