You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. Any assistance required?

USER: This is Nicholas Young.

ASSISTANT: Ok.

USER: I would like to attend TANA Conferences in Minutemaid park (Stadium) at Houston, IAH.

ASSISTANT: Please help me with travelling dates.

USER: I wish to start on 09/22 from Oakland. And return on 09/24 from Houston.

ASSISTANT: Please let me know your departure airport code.

USER: My nearest airport is Oakland, so I want to book a ticket from Oakland, OAK.

ASSISTANT: Any specifications?

USER: I can spend 5000 for ticket fare from my budget. I need a halt in between journey.

ASSISTANT: No flight is available with your requirement.

USER: Ok, no problem.

ASSISTANT: Thanks.

USER: Thank you.