You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from LAS to IAD. Can you please help me in that?

ASSISTANT: Sure, I am glad to help you in booking. Can you please share your travel dates?

USER: My trip dates are Nov 11 to Nov 13.

ASSISTANT: Let me know your connection limit.

USER: I need a direct flight.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: May I know your name?

USER: Myself Andrew Collins.

ASSISTANT: Thank you for reaching us, have a nice day.