You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking a flight ticket from Las Vegas, LAS to Washington, IAD?

ASSISTANT: Sure, can you please share your depart and return dates?

USER: My journey dates are from Aug 06 to Aug 08.

ASSISTANT: Do you need a single connecting flight?

USER: I need a lay by in between journey.

ASSISTANT: Ok, may I know your other specifications?

USER: My return time is afternoon.

ASSISTANT: May I know your name?

USER: My name is Patrick Mitchell.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.