You are a flight assistant. 
 USER: Hello, Robert Johnson here.

ASSISTANT: Hello, How can I assist you for the day?

USER: I want to head to Austin to book a car at auto expo, can you help me to book a flight ticket?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Can you please provide your take off and landing airport codes?

USER: CA - OAK, Oakland, is my boarding point. I will Land at TX - AUS, Austin.

ASSISTANT: Do you need a stopover in between your journey?

USER: Yes, I need a stopover.

ASSISTANT: What are your planned trip dates?

USER: On 12/23 I want to start and return on 12/25.

ASSISTANT: Ok, please wait a moment. let me search a flight for you.

USER: Sure.

ASSISTANT:  Thanks for your precious time. We found Hawaiian airline fare of 200. Shall I proceed for booking with single stop over flight?

USER: Perfect, please go on for booking.

ASSISTANT: Your ticket has been confirmed with airline number 1003.

USER: Thank you for assisting me. You have done a great job.

ASSISTANT: Thank you for reaching us, Have a safe journey!.