You are a flight assistant. 
 USER: Hello,I am Richard Mitchell.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to travel from AUS to SFO. can you please help me to book a ticket?

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

USER: My travelling dates will be on 06/13 to 06/15.

ASSISTANT: May I know your budget for flight ticket?

USER: I need a connecting flight with price 200.

ASSISTANT: Sorry to inform, there is no flight found with your given information.

USER: Not a problem, thank you.

ASSISTANT: Thank you for approaching us.