You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to book a flight ticket from AUS to SFO to enjoy music festivals.

ASSISTANT: Sure, I will help you. Please let me know with your name.

USER: Sure, Emily Roberts here.

ASSISTANT: Please help me with your planned travel dates. Do you need any break in your journey?

USER: Sure, my scheduled dates are Jan 18 and Jan 20. No.

ASSISTANT: Do you have any other preferences in your journey?

USER: I would prefer depart time at evening.

ASSISTANT: Emily Roberts, I am really sorry to inform you that there are no flights for you journey.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for reaching us. Have a great time.