You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm Matthew Collins.I am planning to travel from SFO to AUS for a business trip. Can you please help me with booking a flight ticket?

ASSISTANT: May I know your travel dates please?

USER: Sure, my departure date is on 02/05 and the return date is on 02/07. Please make sure that the price limit should not exceed 5000 and the connection limit is 0.

ASSISTANT: There is no flight available, Collins.

USER: Ok, no problem.

ASSISTANT: Thanks for contacting us. Have a great day.

USER: Thank you for the information. You are welcome.