Hello.
user
Hello, how may I assist you?
assistant
I am Lisa Nelson. Can you help me in booking my flight ticket from OAK to DCA?
user
Sure, can you please provide me your travel dates?
assistant
My travelling dates will be Aug 26th to Aug 28th.
user
Ok, please wait for a while.
assistant
Sure. Make sure that the depart time should be in the evening.
user
I am sorry to tell you that there is no flight available on your preferred travel dates.
assistant
Its ok, thank you.
user
You are welcome.
assistant