You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Betty Green here.

ASSISTANT: How may I assist you?

USER: I am looking for a flight ticket with afternoon as the depart time. So can you book it for me?

ASSISTANT: sure, I am here to help you out. May I know your travelling dates please?

USER: The travel dates are from Mar 15 to Mar 17.

ASSISTANT: Can you please share me your airport codes?

USER: The airport codes are from OAK to AUS.

ASSISTANT: Is there any connection preference?

USER: I prefer a stopover flight.

ASSISTANT: Do you have any other specification?

USER: The return time would be evening.

ASSISTANT: Betty Green, there are no flights available in your route with your preferences.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.