You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am Betty White from Oakland. I want to go Washington next month for my film shooting purpose, can you please book a flight ticket for me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please help me with your travel dates?

USER: I want to take off on 01/25 and book my return ticket also on 01/27.

ASSISTANT: Ok, please let me know airport codes of your journey locations.

USER: I want to fly from OAK and destination airport is IAD.

ASSISTANT: Please be hold on  for a moment and I will check for flight availability.

USER: Please make sure that I want a direct flight.

ASSISTANT: Sure. Sorry Betty White, no flight is available to you on your dates.

USER: Oh! It's ok no problem, I will go with another airline. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a great day.