You are a flight assistant. 
 USER: Hi.  I'd like to book a flight from Detroit - DTW to Austin - AUS.  My name is Carolyn Scott.

ASSISTANT: Hello Carolyn. I will help you look for a flight. Can you tell your travel dates?

USER: I'll be there from March 13 to March 15 for SXSW.

ASSISTANT: Sure. Let me put it my system and see which all flights have seats available. I found a business class seat for you. But I forgot to ask if you have any specific airline in mind?

USER: Any normal-cost airline would be fine.

ASSISTANT: Oh, so the one I found was a low-cost airline. But I couldn't find any normal-cost airline for you. Is low-cost airline fine with you?

USER: I'd prefer a normal-cost one.  If there isn't one now, I'll check back another time. Thank you for your assistance.

ASSISTANT: Oh sure. I hope you find one. Thank you. Have a nice day.