You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Will you please help me in booking a flight ticket from LAS to ORD?

ASSISTANT:  I am here to help you with your concern. Sure, can you please let me know your trip dates?

USER: My trip dates are June 28th and June 30th.

ASSISTANT: Would you like to fly with connecting flight or direct flight?

USER: I would like to fly with direct flight.

ASSISTANT: Are you willing to fly with any airline for your journey?

USER: I will prefer to travel in normal-cost airline.

ASSISTANT: Could you help me with your name please? So, I can check for the flights availability.

USER: Paul Martinez.

ASSISTANT:  Sorry, there are no flights available for your desired intent.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.