You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am looking for a flight from IAD to LAS, can you please help me in booking?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I will start my journey on Mar 28 and return back on Mar 30.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a connecting flight.

ASSISTANT: May I know your good name please?

USER: My name is Anthony Garcia.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.