You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, please provide your trip dates.

USER: Sure, my planned travel dates are Nov 23 and Nov 25.

ASSISTANT: Do you have any other special requirements?

USER: Yes, please look for a normal-cost Airlines.

ASSISTANT: May I know your name please?

USER: Sure, Nancy Williams here.

ASSISTANT: Sorry Nancy, we regret to inform you that there is no flights available as per your request.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Most welcome.