You are a flight assistant. 
 USER: Hello. My name is Michael Garcia.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from AUS to SFO, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 03/26 to 03/28.

ASSISTANT: I found a flight 1001 of Delta airlines matches with your preferences, can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Sorry, there are no flights available.