You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Scott.

ASSISTANT: How can I help you today?

USER: I want to book a ticket from LAS to DCA to attend workshop, can you help me in booking?

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

USER: I am departing on Mar 07 and return on Mar 09.

ASSISTANT: Do you have any airline preference?

USER: I need a flight with normal-cost airline.

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

USER: That's ok, thank you for your information.

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