You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Dennis Allen here.

ASSISTANT: How can I help you?

USER: I am looking for a flight ticket with price below 500. Can you book it?

ASSISTANT: Let me know your airport codes?

USER: My airport codes for boarding the flight are from AUS to IAH.

ASSISTANT: Can I know your travelling dates?

USER: Yes, my travel dates are from Mar 17 to Mar 19. I am looking for a connecting flight.

ASSISTANT: Connecting flight can be booked with airline UA for price 100 having flight number 1029.

USER: I am happy with the cost of the flight ticket. So you can proceed.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.