You are a flight assistant. 
 USER: Hello, I am Nicholas Lee.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to book a flight ticket on 01/11. Can you help me in this?

ASSISTANT: Sure, I will help you with that. Can you please provide your take off and landing airport codes?

USER: I want to fly from Oakland, CA - OAK. I would like to return from San Francisco, CA - SFO.

ASSISTANT:  Let me know your return date?

USER: My return date is on 01/13.

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

USER: Sure.

ASSISTANT:  Thanks for your precious time. We found Delta airline fare of 100. Shall I proceed for booking with single stop over flight?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed with airline number 1024.

USER: Thank you for information.

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