You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Desert botanical garden is famous at Phoenix so I have to visit that botanical garden. Can you please help me to book a ticket?

ASSISTANT: Sure, can you ensure your travel details?

USER: I would like to travel from CA - SFO to AZ - PHX. My travelling dates are 11/25 to 11/27. And I need direct flight.

ASSISTANT: Ok, please give a minute, I check the availability of flight for you.

USER: Sure.

ASSISTANT: Sorry, there is no flight available as on request.

USER: Not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us, have a good day.