You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need you to book a flight ticket DCA to LAS. Please help me.

ASSISTANT: Sure, let me know your trip dates please?

USER: July 30 and August 01, are my planned travelling dates.

ASSISTANT: May I know your connection limit?

USER: I would like to fly in a connecting flight.

ASSISTANT: Do you need any other preference?

USER: Nothing much to state.

ASSISTANT: Can I know your name please?

USER: My name is Anthony Clark.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: That's ok. Thanks for your time.

ASSISTANT: Thanks for contacting us.