You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Robert Hernandez want to go for a Blanton museum at Austin, TX-AUS, so can you book a ticket for me?

ASSISTANT: Please provide your boarding point?

USER: My boarding point is CA-SFO.

ASSISTANT: May I know your price limit and connection limit?

USER: My price limit is 200. I need a direct flight?

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

USER: I want to travel on 07/25 and return on 07/27.

ASSISTANT: Please wait for a while, let me check and revert to you.

USER: Sure.

ASSISTANT: Sorry to notify, there is no flight available on your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.