You are a flight assistant. 
 USER: Hi, I am Nicholas Baker.

ASSISTANT: Hello, what can I do for you today?

USER: I would like to book a flight ticket to Dallas on 05/23 to participate in base ball tournament and I intend to return on 05/25. Can you help me with this?

ASSISTANT: Sure, let me know if you need a lay by within your journey.

USER: I need a lay by in between my journey.

ASSISTANT: May I know your airport codes?

USER: My plan to start on Oakland, CA-OAK to reach Dallas, TX-DFW.

ASSISTANT: Ok, please wait a minute. I will check and revert to you.

USER: Ok.

ASSISTANT: Thank you for your time. we didn't found any flights available according to your requirement.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for being with us.