You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Scott.

ASSISTANT: How can I help you?

USER: I would like to book a flight ticket from San Francisco CA-SFO, to spend free time with my sister after a long time. Could you please assist me in making an airline reservation?

ASSISTANT: Sure, we are here to help you to make your journey comfortable.

USER: Thank you.

ASSISTANT: May I know your planned travel dates?

USER: My planned travel dates are 08/07 and 08/09.

ASSISTANT: May I know your landing airport code?

USER: My landing airport code is Denver CO-DEN.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Ok, no problem at all.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your response.