You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please help me to book a flight ticket from OAK to MSP to meet my family.

ASSISTANT: Sure, may I know your travelling dates?

USER: My planned travel dates are Sept, 2 and Sept, 4.

ASSISTANT: May I know your name for the reservation.

USER: David Carter here.

ASSISTANT: Do you need any connecting flight?

USER: No, I need a direct flight.

ASSISTANT: May I know your other specifications, if any?

USER: No, thanks.

ASSISTANT: Sorry, there are no flight tickets available which is travelling directly.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching our service.