You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to meet my friend at Oakland, please help me to book my flight ticket from ATL to OAK.

ASSISTANT: Sure, can you share me your travelling dates?

USER: I want to depart on Aug 16th and I have to return back on Aug 18th.

ASSISTANT: May I know your connection limit?

USER: I need direct flight.

ASSISTANT: Do you have any airline preference?

USER: I would like to have normal-cost airlines.

ASSISTANT: Can I know your good name please.

USER: My name is Andrew Lee.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.