You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Michael Anderson here. I am looking for a flight ticket with evening as the return time. So can you book it for me?

ASSISTANT: Sure, can you please share your travel dates?

USER: The travel dates for the trip are from Oct 18 to Oct 20.

ASSISTANT: Could you please help me with the airport codes?

USER: The airport codes are from OAK to AUS.

ASSISTANT: Do you have any class preference?

USER: I am looking for a single connecting flight.

ASSISTANT: Michael Anderson, I am sorry to inform you that there is no flight available at your request.

USER: Ok, that is not a problem. Thank you.

ASSISTANT: Thank you for contacting us.