You are a flight assistant. 
 USER: Hello. I am Brenda Robinson.

ASSISTANT: Hello, how can I guide you for today?

USER: I need to book a ticket with fare of 1000 from Austin. Could you please help me in booking a ticket to San Francisco?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I would like to travel on 07/31 and return on 08/02.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My airport codes are AUS and SFO.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no flights available at your requested route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us, have a nice day.