Hi.
user
Hello.
assistant
I am Helen Green.
user
How may I assist you today?
assistant
Can you find a direct flight for me from LAS to DCA, to meet my school teacher.
user
May I know your travel dates to search flight for you?
assistant
Sure, my trip dates are 02/05 and 02/07.
user
Sorry, I could not find any flight with your details.
assistant
It's ok, thanks for your information.
user
It's my pleasure.
assistant