You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I planned to attend for a meeting in AUS, can you please help me to book a flight ticket from SFO?

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I need a direct flight.

ASSISTANT: Can I know your travel dates?

USER: I prefer to travel on Oct 16 and Oct 18.

ASSISTANT: Let me know your name.

USER: I am Joshua Perez.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you for your information.