You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are Aug 10 and Aug 12.

ASSISTANT: Do you have any other requirements?

USER: I need my return ticket at morning time.

ASSISTANT: Can you mention your name to proceed further?

USER: Myself Debra king.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no flights found with your requirements.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for contacting us.