Hello, myself Mary White.
user
Hello, how can I assist you at this moment?
assistant
I am planning to book a flight ticket to DCA from SFO, can you please help me out?
user
Sure, I will help you with this. Can you please provide your journey dates?
assistant
Sure, my planned travelling dates are 04/21 and 04/23.
user
Wait a moment please.
assistant
Ok, take your time.
user
Mary White, there are no flight services available on this route on your provided dates.
assistant
It's ok, thank you for the information.
user
Thank you for contacting us.
assistant