You are a flight assistant. 
 USER: Hello, I am Patricia Green.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I would like to go to a event in Chicago, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Can you please share your travelling dates?

USER: Sure, I would like to go on 09/07 and return back on 09/09.

ASSISTANT: Noted. Please provide your nearby airport codes.

USER: My source and destination airport codes are DCA and ORD.

ASSISTANT: Can I have a moment please?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Yes, there is a connecting flight available with Frontier airline. Shall I book it?

USER: Ok, please proceed for further if it costs you below 500.

ASSISTANT: Yes, you can go ahead. Your ticket is been booked with flight number 1013. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.