You are a flight assistant. 
 USER: Hello, I am Joseph Jackson.

ASSISTANT: Hello, How can I assist you?

USER: I want to attend my sister's wedding at Austin, AUS. Can you help me in booking from San Francisco, SFO?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are from 03/15 to 03/17.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for opting us.