You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Could you please book a flight ticket from OAK to ATL as I want to attend a sports festival?

ASSISTANT: Sure, can I know your travelling dates?

USER: I want to travel on May 10 and return back on May 12.

ASSISTANT: On which name should I reserve the flight ticket?

USER: My name is David Green.

ASSISTANT: Do you have any connection limit?

USER: No, I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.