You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please book a flight ticket from AUS to SFO?

ASSISTANT: Can I know your travelling dates?

USER: Thank you. I have planned my travel dates as Apr 13 and Apr 15.

ASSISTANT: Can I know your name please?

USER: Sure, myself Steven Nelson.

ASSISTANT: Please let me know your preference?

USER: I would like to depart in afternoon time so please make sure that.

ASSISTANT: Here is a flight ticket with fare 200 and 1009 as flight number in Delta Airline. Shall I proceed with booking?

USER: That is fine, please proceed with booking.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.