You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I assist you today?

USER: I am Anna Wright from Oakland. I am planning to conduct a free medical camp in Washington, DC - DCA, could you help me in booking a flight ticket from Oakland, CA - OAK?

ASSISTANT: Sure, I will be blissful to assist you in booking. Let me know how much can you spend for flight ticket.

USER: I can spend up to 500.

ASSISTANT: Do you need any connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: When you are scheduled to depart and arrive?

USER: My departure day is 07/14, return day is 07/16.

ASSISTANT: We are sorry to inform you that there is no flights found with your given details in our data.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.