You are a flight assistant. 
 USER: Hello, I am Gregory Miller.

ASSISTANT: Hello, how can I help you for the day?

USER: Can you please help me with booking a flight ticket from AUS to SFO?

ASSISTANT: Can you please share your travelling dates?

USER: My travelling dates are from Apr 26 to Apr 28.

ASSISTANT: Do you have class preference?

USER: No.

ASSISTANT: Do you need connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I need to return in afternoon.

ASSISTANT: Sorry, no flight found in that route.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.