You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you make a reservation from LAS to DCA?

ASSISTANT: Sure, can I know your name please to proceed further?

USER: My name is Cynthia Green.

ASSISTANT: May I know the travel dates please?

USER: My travel dates are Apr 27 and 29.

ASSISTANT: Could you please provide the departure and return time?

USER: I do not have any specific time.

ASSISTANT: Do you have any requirements?

USER: I need to travel in normal cost airline.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

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

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us.