You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Stephanie Carter. I want to book a flight ticket to visit Oakland Zoo at Oakland, could you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: I would like to fly on 09/09 and return on 09/11.

ASSISTANT: Kindly, mention your price limit.

USER: I can afford up to 500.

ASSISTANT: May I know your airport codes?

USER: My source is Washington, DC - IAD and destination code is CA - OAK.

ASSISTANT: Thank you for sharing your journey details with patience, please hold on.

USER: Sure, I need a direct flight.

ASSISTANT: No flights found on your journey dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you, have a nice day.