You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Barbara Wilson.

ASSISTANT: How may I help you?

USER: I am planning to attend music concert at LGA, can you please help me with booking a flight ticket from ORD?

ASSISTANT: May I know your trip dates?

USER: Sure, I would like to take off on 09/17 and return back on 09/19.

ASSISTANT: There is a flight for you with 1 connection in Frontier airline and fare is 600. Shall I proceed?

USER: I need a flight with price 500.

ASSISTANT: There is no flights available.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Most welcome.