You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Ronald Lee here. I'm planning to visit my uncle's home, can you book a ticket from AUS to SFO?

ASSISTANT: Sure, May I know the journey dates?

USER: Sure, my planned departure and return travel dates are 10th and 12th of February.

ASSISTANT: Do you have any connection limit?

USER: Yes, it is 1.

ASSISTANT: Do you have any preference in return time?

USER: Yes, I want to return in the morning time.

ASSISTANT: Is there any other requirements?

USER: No, I don't have.

ASSISTANT: Please wait a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for opting us.