You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Hall here.

ASSISTANT: How can I help you?

USER: I have planned to visit national park in Las Vegas, will you please book a flight ticket?

ASSISTANT: Sure, can I know your travel dates?

USER: My dates of travelling are 06/18 and 06/20.

ASSISTANT: May I know your airport codes?

USER: Airport codes are ORD and LAS.

ASSISTANT: Give me a minute, I will be back with the details.

USER: Sure, take a time.

ASSISTANT: The flight 1008 of Frontier airlines of price 100 and with 1 connection is available on your requested dates. Shall I book the ticket?

USER: Yes, please book it.

ASSISTANT: Your ticket is booked.

USER: Thank you for booking.

ASSISTANT: Welcome.