Hello,.
user
Hello. How may I assist you today?
assistant
Please could you book a ticket from Boston, MA-BOS to Denver, CO-DEN.
user
May I know your travelling dates to search a flight?
assistant
Sure. Start date is 11/19 and will return by 11/21.
user
May I know your name to proceed further?
assistant
I am Debra Green.
user
Sorry, I could not find any flight with your travel dates.
assistant
Thanks.
user
My pleasure.
assistant