Hello,. I am Angela Lewis.
user
Hello, how may I help you?
assistant
My friends are planning to visit Alcatraz Island in San Francisco, SFO.
user
Sure, can I know your preferable dates?
assistant
Can you please book a flight ticket with connecting flight? My journey dates on 02/25 and 02/27.
user
Ok, let me know your origin airport code?
assistant
My source  point is Denver, DEN.
user
Sorry, there are no flights available for given dates.
assistant
Ok, no problem. Thank you for your information.
user
Thank you for contacting us, have a great day.
assistant