You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Paul Garcia from Austin. I have to go to Washington next month so can you please book a flight ticket from AUS to DCA?

ASSISTANT: Sure, may I know your travelling dates please?

USER: Thank you for your response, I want to take off on Sept 19 and please confirm my return ticket also on Sept 21.

ASSISTANT: Is there any class preference?

USER: Yes, I want a business class flight.

ASSISTANT: Do you have any connection in between your journey?

USER: Yes, I want 1 break in between my journey.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Unfortunately we did not find any find any flight on your given information.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you.

USER: Thank you for your information.