Hello. I am Thomas Brown.
Hello, how can I assist you today?
Can you please book a flight ticket from IAD to OAK?
Sure, we are here to help you with this. May I know your travelling dates, please?
Sure, I need to travel on dates of Feb 28 and Mar 01.
Do  you have any other specifications?
Yes, I need connection 1.
Sorry to inform you that, there is no flight available in this route on the dates you have given.
Oh! It is sad to hear. Anyway, thank you for your time.
You are welcome, thank you for reaching us.