You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Would you please help me in booking a ticket from AUS to OAK.

ASSISTANT: Sure, may I know your name please?

USER: Susan Perez.

ASSISTANT: May I know your planned travelling dates please?

USER: My planned travel dates are as follows June 21 and June 23.

ASSISTANT: May I know your class preference please?

USER: No class preference, but I would like to book a connecting flight.

ASSISTANT: May I know your preferable time for journey?

USER: No, thank you for asking.

ASSISTANT: Sorry Perez, there is no flight found as per your travelling details.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for reaching us.